More than just anal sex: the potential for sexually transmitted infection transmission among men visiting sex-on-premises venues

High Prevalence of Rectal Chlamydia and Gonorrhea Among Men Who Have Sex With Men Who Do Not Engage in Receptive Anal Sex

BACKGROUND

In the United States, annual screening for rectal gonorrhea and chlamydia is only recommended for men who report receptive anal sex (RAS), but other behaviors (e.g., rimming) may lead to rectal Chlamydia trachomatis and Neisseria gonorrhoeae acquisition.

METHODS

We enrolled individuals assigned male sex at birth who reported sex with men and denied RAS in the past 2 years or reported RAS 1 to 2 years ago but were tested and treated since last RAS. Participants enrolled in-person at the Sexual Health Clinic in Seattle, Washington (December 2019-July 2022), or online (July 2021-March 2022). Participants completed a survey that asked about 13 non-RAS behaviors and self-collected a rectal swab for gonorrhea/chlamydia nucleic acid amplification testing. We used log binomial regression to estimate the prevalence of rectal gonorrhea/chlamydia (adjusted prevalence ratio [aPR]) by behavior, adjusting for all other behaviors.

RESULTS

We enrolled 292 participants (247 in-person and 45 online); 277 (95%) had nucleic acid amplification testing results. Rectal gonorrhea/chlamydia test positivity was 14.1% overall: 10.5% for rectal chlamydia and 4.3% for rectal gonorrhea. Most participants (70%) reported ≥1 behavior that involved direct contact with their anus. We observed a higher risk of rectal chlamydia for those who did versus did not report perianal play at 12 months (aPR, 2.39; 95% confidence interval, 1.10-5.22) and 2 months (aPR, 2.21; 95% confidence interval, 1.02-4.79). This was the only behavior significantly associated with testing positive.

CONCLUSIONS

Rectal C. trachomatis and N. gonorrhoeae prevalence was high among men who deny RAS, suggesting other possible routes of acquisition. Rectal screening for those who deny RAS should be made with careful consideration of individual- and population-level effects.

A gonococcal vaccine has the potential to rapidly reduce the incidence of Neisseria gonorrhoeae infection among urban men who have sex with men

Background

A gonococcal vaccine is urgently needed due to increasing gonorrhea incidence and emerging multidrug-resistant gonococcal strains worldwide. Men who have sex with men (MSM) have among the highest incidences of gonorrhea and may be a key target population for vaccination when available.

Methods

An individual-based, anatomical site-specific mathematical model was used to simulate Neisseria gonorrhoeae transmission in a population of 10 000 MSM. The impact of vaccination on gonorrhea prevalence was assessed.

Results

With a gonococcal vaccine of 100% or 50% protective efficacy, gonorrhea prevalence could be reduced by 94% or 62%, respectively, within 2 years if 30% of MSM are vaccinated on presentation for sexually transmitted infection (STI) testing. Elimination of gonorrhea is possible within 8 years with vaccines of ≥ 50% efficacy lasting 2 years, providing a booster vaccination is available every 3 years on average. A vaccine’s impact may be reduced if it is not effective at all anatomical sites.

Conclusions

Our study indicates that with a vaccine of modest efficacy and an immunization strategy that targets MSM presenting for STI screening, the prevalence of gonorrhea in this population could be rapidly and substantially reduced.

Modelling response strategies for controlling gonorrhoea outbreaks in men who have sex with men in Australia

The ability to treat gonorrhoea with current first-line drugs is threatened by the global spread of extensively drug resistant (XDR) Neisseria gonorrhoeae (NG) strains. In Australia, urban transmission is high among men who have sex with men (MSM) and importation of an XDR NG strain in this population could result in an epidemic that would be difficult and costly to control. An individual-based, anatomical site-specific mathematical model of NG transmission among Australian MSM was developed and used to evaluate the potential for elimination of an imported NG strain under a range of case-based and population-based test-and-treat strategies. When initiated upon detection of the imported strain, these strategies enhance the probability of elimination and reduce the outbreak size compared with current practice (current testing levels and no contact tracing). The most effective strategies combine testing targeted at regular and casual partners with increased rates of population testing. However, even with the most effective strategies, outbreaks can persist for up to 2 years post-detection. Our simulations suggest that local elimination of imported NG strains can be achieved with high probability using combined case-based and population-based test-and-treat strategies. These strategies may be an effective means of preserving current treatments in the event of wider XDR NG emergence.

In most high-income settings, gonorrhoea is endemic among men who have sex with men (MSM). While gonorrhoea remains readily treatable with antibiotics, there are major concerns about the threat of antimicrobial resistance arising from recent reports of treatment failure with first-line therapy and limited remaining treatment options. Here we investigated the potential for test-and-treat response strategies to eliminate such strains before their prevalence reaches a level requiring a shift to new first line therapies. Rather than directly consider resistance, we explore the mitigating effect of various test-and-treat measures on outbreaks of a generic imported strain which remains treatable. This is done within the framework of a realistic mathematical model of gonorrhoea spread in an MSM community that captures cases, anatomical sites of infection and sexual contacts at an individual level, calibrated to relevant Australian epidemiological data. The results indicate that strategies such as partner testing and treatment in combination with elevated asymptomatic community testing are highly effective in mitigating outbreaks but can take up to 2 years to achieve elimination. As there are currently no clear alternative drugs of proven efficacy and safety to replace ceftriaxone in first-line therapy, these promising results suggest potential for use of these outbreak response strategies to preserve current treatment recommendations.

Countering the rise of syphilis: A role for doxycycline post-exposure prophylaxis?

Doxycycline post-exposure prophylaxis (PEP) holds the potential to mitigate increasing rates of syphilis among sexual minority men (SMM) in the US yet has received limited attention. Since evaluation of this intervention in actual populations is not currently feasible, we used agent-based models (ABM) to assess the population-level impact of this strategy. We adapted ABM of HIV and HPV transmission, representing a population of 10,230 SMM in Philadelphia, Pennsylvania, US. Parameter inputs were derived from the literature, and ABM outputs during the pre-intervention period were calibrated to local surveillance data. Intervention scenarios varied doxycycline uptake by 20, 40, 60, 80 and 100%, while assuming continued condom use and syphilis screening and treatment. Under each intervention scenario, we incorporated treatment adherence at the following levels: 0, 20, 40, 60, 80 and 100%. Long-term population impact of prophylactic doxycycline was measured using the cumulative incidence over the 10-year period and the percentage of infections prevented attributable to doxycycline at year 10. An uptake scenario of 20% with an adherence level of 80% would reduce the cumulative incidence of infections by 10% over the next decade, translating to 57 fewer cases per 1000 SMM. At year 10, under the same uptake and adherence level, 22% of infections would be prevented due to doxycycline PEP in the instances where condoms were not used or failed. Findings suggest that doxycycline PEP will have a modest impact on syphilis incidence when assuming a reasonable level of uptake and adherence. Doxycycline PEP may be most appropriate as a secondary prevention measure to condoms and enhanced syphilis screening for reducing infections among SMM.

Brief Report: Group Sex Among Men Who Have Sex With Men in the Era of PrEP: A Cross-Sectional Study

BACKGROUND

Group sex has been commonly reported among gay and bisexual men who have sex with men (GBMSM); however, there are limited studies on the factors associated with participating in group sex.

SETTING

A cross-sectional study among GBMSM attending a sexual health clinic in Melbourne, Australia.

METHODS

Univariable and multivariable logistic regression were performed to examine the association between GBMSM participating in group sex in the previous 3 months and their demographic characteristics, including age, pre-exposure prophylaxis (PrEP) use, HIV status, any STI (gonorrhea, chlamydia, syphilis) diagnosis on the day, and method of seeking partners.

RESULTS

There were 357 GBMSM who participated in the survey and their mean age was 32.9 years (SD = 10.9). Almost a third (n = 115; 32.2%) had participated in group sex in the previous 3 months. GBMSM who sought sex partners at sex on premises venues (SOPVs) [aOR 5.83; 95% confidence interval (CI): 3.23 to 10.53] had the highest odds of group sex participation after adjusting for other potential confounders. Compared with GBMSM not living with HIV and not taking PrEP, GBMSM taking PrEP had higher odds of group sex participation (aOR 2.09; 95% CI: 1.05 to 4.15), but GBMSM living with HIV did not (aOR 0.93; 95% CI: 0.23 to 3.68).Recent group sex participation was not associated with being diagnosed with any STI (chlamydia, syphilis, or gonorrhea) on the day in the adjusted analyses.

CONCLUSION

PrEP users and MSM attending SOPVs are more likely to participate in group sex. SOPV could be important venues for future public health campaigns.

Age pattern of sexual activities with the most recent partner among men who have sex with men in Melbourne, Australia: a cross-sectional study

BACKGROUND

Sexual behavioural studies among men who have sex with men (MSM) are predominantly focused on penile-anal intercourse. Other non-anal sexual activities are under-studied. This study aimed to examine the age pattern of a range of sexual activities among MSM with the most recent male sex partner.

METHODS

We conducted a survey among MSM attending the Melbourne Sexual Health Centre in 2017. This survey asked about nine different sexual activities with their most recent regular and casual partner. A Chi-square trend test was used to examine the age patterns of each sexual activity.

RESULTS

A total of 1596 men answered the survey and their median age was 30 (IQR 25-37) years. With casual partners, kissing was the most common activity (92.4%), followed by performing penile-oral sex (86.0%) and receiving penile-oral sex (83.9%). The least common activity was insertive rimming (38.1%). Young men were more likely to engage in kissing (p_trend<0.001), receptive rimming (p_trend=0.004) and receptive penile-anal sex (p_trend<0.001) but they were less likely to have insertive penile-anal sex compared with older MSM. With regular partners, the most common activity was kissing (97.4%), followed by touching penises (90.0%) and performing penile-oral sex (88.3%). Age was not associated with most types of sexual activity with regular partners except mutual masturbation and receptive penile-anal sex. Younger men were more likely to masturbate mutually (p_trend=0.028) and engage in receptive penile-anal sex (p_trend=0.011).

CONCLUSIONS

The pattern of sexual activities shows age-related differences with casual partners but less so with regular partners in MSM.

The role of saliva in gonorrhoea and chlamydia transmission to extragenital sites among men who have sex with men: new insights into transmission

INTRODUCTION

Gonorrhoea and chlamydia cases have been rising among gay, bisexual and other men who have sex with men (MSM) over the last decade. The majority of cases are extragenital and occur at the oropharynx and anorectum. The aim of this narrative review was to review the risk factors and mode of transmission for gonorrhoea and chlamydia at the oropharynx and anorectum among MSM.

RESULTS AND DISCUSSION

New evidence suggests that oropharyngeal gonorrhoea can be transmitted by kissing in addition to through the established route of condomless oral sex; and anorectal gonorrhoea can be acquired when saliva is used as a lubricant for anal sex and rimming in addition to the established route of condomless penile-anal sex in MSM. In contrast, condomless penile-anal sex remains the major route for chlamydia transmission.

CONCLUSIONS

Substantial transmission of gonorrhoea may occur with practices other than the established routes of condomless oral and/or anal sex and hence condoms may not be effective in preventing gonorrhoea transmission to extragenital sites. In contrast, condoms are effective for chlamydia control because it is mainly transmitted through condomless penile-anal sex. Novel interventions for gonorrhoea that reduce the risk of transmission at extragenital site are required.

Modeling HPV vaccination scale-up among urban young men who have sex with men in the context of HIV

INTRODUCTION

Young men who have sex with men (YMSM) are at high risk to contract human papillomavirus (HPV). While an effective vaccination exists, its use among YMSM is markedly lower compared to non-MSM and women. This study compares scaling up HPV vaccination in conjunction with other prevention strategies.

METHODS

An agent-based model of urban YMSM (≤26 years of age) reflective of the demography of Philadelphia, PA, simulated for up to ten years of follow-up to examine anal and oral transmission of the HPV genotypes covered in the nonavalent (9v) vaccine: 6, 11, 16, 18, 31, 33, 45, 52, 58. Starting HPV prevalences ranged from a high of 18% (type 6) to a low of 6% (type 31); overall 65% of individuals carried any HPV genotype. Simulated levels of vaccination were ranged from 0% to 13% (present-day level), 25%, 50%, 80% (Healthy People 2020 target), and 100% in conjunction with condom use and HIV seroadaptive practices. The primary outcome was the relative reduction in HPV infection.

RESULTS

Compared to present-day vaccination levels (13%), scaling-up vaccination led to expected declines in 10-year post-simulation HPV prevalence. Anal HPV (any 9v types) declined by 9%, 27%, 46%, and 58% at vaccination levels of 25%, 50%, 80%, and 100%, respectively. Similarly, oral HPV (any 9v types) declined by 11%, 33%, 57%, and 71% across the same levels of vaccine uptake. Comparing the prevention strategies, condoms blocked the greatest number of anal transmissions when vaccination was at or below present-day levels. For oral transmission, vaccination was superior to condom use at all levels of coverage.

CONCLUSIONS

Public health HPV preventions strategies should continue to emphasize the complementary roles of condoms and vaccination, especially for preventing oral infection. Improving vaccination coverage will ultimately have the greatest impact on reducing HPV infection among YMSM.

Rethinking Risk, Culture, and Intervention in Collective Sex Environments

This article provides a narrative overview of research on HIV/STI risk and collective sexual behavior based on an inclusive analysis of research on environments where people gather for sexual activity-sex clubs, swingers' clubs, bathhouses, parks, private sex parties, etc. The aim is to analyze how collective sex has been approached across disciplines to promote conversation across paradigms and suggest new lines of inquiry. Attention to context-such as the location of sex-was a necessary redress to universalizing models of sexual risk-taking behavior, leading to insights rooted in the particularities of each environment and its users. However, the identification of ever more precise risk groups or environmental idiosyncrasies eventually becomes theoretically restrictive, leading to an overestimation of the uniqueness of sexual enclaves, and of the difference between any given enclave and the broader social milieu. Using a theoretical framework of transgression to interpret the interdisciplinary literature, similarities in the spatial and social organization of collective sex environments are identified. Insights generated from this complementary perspective are then applied to understandings of collective sex: first, the example of male-female (MF) "swingers" is used to illustrate the need to establish, rather than assume, the distinctiveness of each non-normative sexual enclave, and to broaden the conceptualization of context; second, questions are raised about the practicality of interventions in collective sex environments. Finally, new lines of intellectual inquiry are suggested to shed light not just on collective sex but on sociosexual issues more generally, such as increasing protective sexual health behavior or negotiating consent in sexual encounters.

Sexual Risk Behaviors and Perceptions of Men Who Go to Gay Sex Parties in New York City: Comparisons Between Three HIV Groups

Men who have sex with men (MSM) who attend group-sex events often engage in risky sexual behaviors that contribute to the high human immunodeficiency virus (HIV) incidence among this population. We conducted an online survey with 211 New York City MSM who attended sex parties in the prior year and asked them to describe their behaviors and perceptions of risk. We compared responses from HIV-positive-undetectable men (n = 36), HIV-negative men on pre-exposure prophylaxis (PrEP; n = 62), and HIV-negative men never on PrEP (n = 113). In bivariate analyses, undetectable and on-PrEP men had been to more sex parties in the prior six months, had more anal sex partners there, and had higher rates of sexually transmitted infection (STI) diagnoses than men never on PrEP. Although less than the other groups, 43% of the presumably HIV-negative men never on PrEP reported condomless anal sex at a party in the prior six months. About half of participants agreed that, at sex parties, they made assumptions about others' HIV status, that they sometimes took more risks than intended, and that the atmosphere of these events was conducive to risk taking. Most disagreed that there was discussion of HIV status at sex parties. Implications for sexual health interventions are discussed.

Identifying factors that lead to the persistence of imported gonorrhoeae strains: a modelling study

OBJECTIVE

The importation of Neisseria gonorrhoeae (NG) strains from overseas is believed to be the main source of antimicrobial resistance in Australia. With recent sporadic cases of ceftriaxone-resistant gonorrhoea reported in Australia and elsewhere, we sought to model the potential for imported NG strains to persist in the men who have sex with men (MSM) population in Australia.

METHODS

We developed an individual-based model to simulate the transmission of NG in a population of urban MSM, and used this model to investigate factors contributing to the probability that an imported NG strain will persist.

RESULTS

The probability of the imported NG strain persisting as the result of a single importation event is less than 1%, but the probability increases to 1% if the imported NG strain is resistant to treatment, and further increases to 3.1% if the imported NG strain can also form mixed infections with the local NG strain. The probability of the imported NG strain persisting increases to 4.4% if there are at least three importation events per month within a 1-year period.

CONCLUSION

The imported NG strain is unlikely to persist as a result of a single importation event. However, the probability of persistence increases if the imported NG strain is resistant to treatment, can form mixed infections with the local NG strain or there are frequent importation events. Identification of the factors that determine the likelihood of persistence of an imported NG strain could contribute to our capacity to respond appropriately and in a timely fashion.

The Road Less Travelled: Exploring Gay and Bisexual Men's Explanations of 'Uncommon' Routes of HIV Transmission

Although there are practices other than condomless anal intercourse that may result in HIV transmission among gay and bisexual men, very little is known about these 'uncommon' transmission explanations. To address this topic, the free text survey responses from 465 HIV positive gay men in Australia were thematically analysed; 123 participants offered uncommon explanations for their seroconversion. Men described several sexual acts they believed led to infection, categorised as adventurous sex (e.g., fisting) and foreplay (e.g., oral sex). Participants also identified mediating factors associated with their seroconversion, either internal (e.g., cum/pre-cum) or external (e.g., sores, illness) to sex. Finally, contextual forces associated with infection were also explored, namely physical spaces (e.g., sex on premises venues) or mental states (e.g., depression). While some uncommon explanations are unlikely to have resulted in HIV transmission, these accounts reveal the diverse and intersecting ways that men attempt to make sense of their seroconversion.

Venue-Based Networks May Underpin HCV Transmissions amongst HIV-Infected Gay and Bisexual Men

Background

This study aimed to investigate the potential influence of venue-based networks on HCV transmission in HIV-positive gay and bisexual men (GBM).

Methods

This was a prospectively recruited cohort of HIV-infected GBM with recently-acquired HCV infection resident in Melbourne and Sydney. Clinical and demographic data were collected together with blood samples for HCV sequencing. Phylogenies were inferred and clusters of individuals infected with HCV with genetic sequence homology were identified. Venues used for sourcing sexual partners were identified; sourcing partners from the same venue was considered a potential social link. Using the Jaccard similarity coefficient, associations were identified between the network of sites where men sourced sex partners and transmission relationships as defined by phylogenetic clustering.

Results

Forty individuals were recruited, of whom 62.5% were considered to have sexually- and 37.5% IDU-acquired HCV. Venue use was consistent with men being members of a more sexually adventurous gay community subculture. Six phylogenetically-determined pairs or clusters were identified, comprising fifteen (15/28, 53.6%) individuals. Participants belonging to phylogenetic clusters were observed within the same networks. There was a significant correlation between the network and phylogenetic clustering when both cities were considered simultaneously (p = 0.005), raising the possibility that social connections may be important for HCV transmissions.

Conclusions

Venue-based network elicitation is a promising approach for elucidating HCV transmissions amongst HIV-infected GBM. Public health approaches targeting individuals and venues prominent within networks may reduce onward HCV transmission.

Saliva use as a lubricant for anal sex is a risk factor for rectal gonorrhoea among men who have sex with men, a new public health message: a cross-sectional survey

BACKGROUND

Apart from penile-anal intercourse, other anal sexual practices (rimming, fingering and saliva use as a lubricant for anal sex) are common among men who have sex with men (MSM). The aim of this study is to evaluate whether these anal sexual practices are risk factors for rectal gonorrhoea in MSM.

METHOD

A cross-sectional survey was conducted among MSM attending Melbourne Sexual Health Centre between 31 July 2014 and 30 June 2015. Rectal gonorrhoea cases were identified by culture.

RESULTS

Among 1312 MSM, 4.3% (n=56) had rectal gonorrhoea. Other anal sexual practices were common among MSM: receptive rimming (70.5%), receptive fingering or penis dipping (84.3%) and using partner's saliva as a lubricant for anal sex (68.5%). Saliva as a lubricant (adjusted OR 2.17; 95% CI 1.00 to 4.71) was significantly associated with rectal gonorrhoea after adjusting for potential confounding factors. Receptive rimming and fingering or penis dipping were not statistically associated with rectal gonorrhoea. The crude population-attributable fraction of rectal gonorrhoea associated with use of partner's saliva as a lubricant for anal sex was 48.9% (7.9% to 71.7%).

CONCLUSIONS

Saliva use as a lubricant for anal sex is a common sexual practice in MSM, and it may play an important role in gonorrhoea transmission. Almost half of rectal gonorrhoea cases may be eliminated if MSM stopped using partner's saliva for anal sex.

Beyond Anal Sex: Sexual Practices of Men Who have Sex with Men and Associations with HIV and Other Sexually Transmitted Infections

INTRODUCTION

Unprotected anal intercourse is often used as a single indicator of risky behavior in men who have sex with men (MSM), yet MSM engage in a variety of behaviors that have unknown associations with sexually transmitted infection (STI) and HIV.

AIM

To assess the prevalence of a wide range of sexual behaviors and their associations with prevalent STI and HIV.

METHODS

We used a standardized, self-administered survey to collect behavioral data for this cross-sectional study of 235 MSM seeking care in a public clinic for sexually transmitted diseases.

MEAN OUTCOME MEASURES

Using modified Poisson regression, we generated unadjusted and adjusted prevalence ratios (PRs) to characterize associations between recent participation in each behavior and prevalent STI and HIV.

RESULTS

Participants' median age was 26 years. One third (35%) were positive for STI. STI prevalence was significantly associated with using sex slings (adjusted PR [aPR] = 2.35), felching (aPR = 2.22), group sex (aPR = 1.86), fisting (aPR = 1.78), anonymous sex (aPR = 1.51), and sex toys (aPR = 1.46). HIV prevalence was 17% and was significantly associated with fisting (aPR = 4.75), felching (aPR = 4.22), enemas (aPR = 3.65), and group sex (aPR = 1.92).

CONCLUSION

Multiple behaviors were significantly associated with prevalent STI and HIV in adjusted analyses. To provide a more comprehensive understanding of sexual risk in MSM, prospective studies are needed to examine whether these behaviors are causally associated with HIV and STI acquisition.

Substantial increases in chlamydia and gonorrhea positivity unexplained by changes in individual-level sexual behaviors among men who have sex with men in an Australian sexual health service from 2007 to 2013

BACKGROUND

To determine the risk-adjusted temporal trend of gonorrhea and chlamydia positivity and associated risk behaviors among men who have sex with men (MSM) attending a sexual health clinic in Melbourne in Australia.

METHODS

Gonorrhea and chlamydia positivity by anatomical site adjusted for year of test, age, number of sexual partners, and condom use among MSM attending Melbourne Sexual Health Centre from 2007 to 2013 were calculated using generalized estimating equation regression models.

RESULTS

A total of 12,873 MSM were included with a median age of 30.0 years. The proportion with pharyngeal, urethral, and anal gonorrhea was 1.7%, 2.3%, and 2.9%, respectively. The adjusted odds of gonorrhea positivity increased by 9% (95% confidence interval [CI], 3%-15%), 11% (95% CI, 6%-17%), and 12% (95% CI, 7%-17%) per year, respectively. The proportion of MSM who were infected with anal chlamydia was 5.6%, with an average increase of 6% (95% CI, 3%-10%) per year; however, no significant change was observed in urethral chlamydia positivity (adjusted odds ratio, 1.02; 95% CI, 0.98-1.06). Increases in gonorrhea and chlamydia positivity were primarily restricted to MSM who reported more than 10 partners in 12 months. The number of partners in the last 12 months fell from 16.6 to 10.5, whereas consistent condom use with casual partners decreased from 64.6% to 58.9% over the study period.

CONCLUSIONS

Gonorrhea and chlamydia have increased among MSM despite the decrease in the number of sexual partners and are occurring primarily in MSM with high numbers of partners and persist after adjusting for known risk factors, suggesting that unmeasured factors (e.g., more assortative mixing patterns) may explain the observed changes.

High prevalence of rectal gonorrhoea among men reporting contact with men with gonorrhoea: Implications for epidemiological treatment

Background

This study aimed to determine the prevalence of gonorrhoea and factors associated with rectal gonorrhoea among men reporting sexual contact with men with gonorrhoea.

Methods

Men who presented to Melbourne Sexual Health Centre reporting sexual contact with a male with gonorrhoea were prospectively identified between March 2011 and December 2013. These men were screened for pharyngeal and rectal gonorrhoea using culture. The prevalence of gonorrhoea among contacts was compared to that among all men who have sex with men (MSM) screened at the clinic over the same period.

Results

Among 363 contacts of gonorrhoea the prevalence of rectal gonorrhoea was 26.4 % (95 % CI: 21.8 %-31.0 %) compared to 3.9 % (95 % CI: 3.7 %-4.2 %) among clinic attendees (p < 0.001). The prevalence of pharyngeal gonorrhoea among contacts was 9.4 % (95 % CI: 6.4 %-12.4 %) compared to 2.1 % (95 % CI: 1.9 %-2.4 %) among clinic attendees (p < 0.001). Among contacts who reported not always using condoms during receptive anal sex with casual partners, rectal gonorrhoea was cultured in 42.4 % compared with 12.7 % among contacts reporting no receptive anal sex (p < 0.001) and 20.2 % among those reporting always using condoms (p < 0.001). On multivariate analysis rectal gonorrhoea was associated with inconsistent condom use during receptive anal sex with casual partners (adjusted odds ratio (AOR): 4.16; 95 % CI: 1.87-9.26) and a reported past history of gonorrhoea (AOR: 1.77; 95 % CI: 1.01-3.14).

Conclusions

The high proportion of positive cases of gonorrhoea among contacts in this study supports epidemiological treatment of MSM presenting as contacts of gonorrhoea.

Ratio of anogenital warts between different anatomical sites in homosexual and heterosexual individuals in Australia, 2002-2013: implications for susceptibility of different anatomical sites to genital warts

There is little known regarding the transmissibility of human papillomavirus (HPV) between different sites in men who have sex with men (MSM) and heterosexual individuals. We conducted a retrospective analysis investigating all new patients attending the Melbourne Sexual Health Centre in Australia between 2002 and 2013. We describe the prevalence and ratio of the first episode of anogenital warts in MSM and heterosexual males and females. The proportion of new MSM clients with anal and penile warts was 4·0% (362/8978) and 1·6% (141/8978), respectively; which gave an anal-to-penile wart ratio of 1:2·6. About 13·7% (1656/12112) of heterosexual males had penile warts and 10·0% (1121/11166) of females had vulval warts, which yielded a penile-to-vulval wart ratio of 1:0·7. Penile-anal transmission has a higher ratio than penile-vulval transmission, suggesting that the anal epithelium may be more susceptible to HPV infection than the vulval epithelium in females; these ratios are important in modelling the control of HPV in MSM.

Duration of syphilis symptoms at presentations in men who have sex with men in Australia: are current public health campaigns effective?

The rapid rise in syphilis cases has prompted a number of public health campaigns to assist men who have sex with men (MSM) recognize and present early with symptoms. This study aimed to investigate the temporal trend of the duration of self-report symptoms and titre of rapid plasma reagin (RPR) in MSM with infectious syphilis. Seven hundred and sixty-one syphilis cases in MSM diagnosed at the Melbourne Sexual Health Centre (MSHC) from 2007-2013 were reviewed. Median duration of symptoms and RPR titres in each year were calculated. The median durations of symptoms with primary and secondary syphilis were 9 [interquartile range (IQR) 6-14] days and 14 (IQR 7-30) days, respectively. The overall median titre of RPR in secondary syphilis (median 128, IQR 64-256) was higher than in primary syphilis (median 4, IQR 1-32) and in early latent syphilis (median 32, IQR 4-64). The median duration of symptoms for primary syphilis, secondary syphilis and titre of RPR level did not change over time. Public health campaigns were not associated with a significant shorter time from onset of symptoms to treatment. Alternative strategies such as more frequent testing of MSM should be promoted to control the syphilis epidemic in Australia.

Health promotion within a sex on premises venue: notes from the field

Despite their historical controversy as perceived public health risks, sex on premises venues (SOPV) such as saunas and sex clubs can afford structured opportunities for on-site sexual health interventions within a supportive, regulated and confidential environment. Building upon previous interventions to deliver on-site clinical and health promotion programmes, an education and referral outreach service was established at one particular SOPV within the inner Brisbane city area. This report outlines the experiences of that on-site education/referral outreach over a five-year period. The service did afford opportunities for a minority of patrons to discuss concerns, resolve misunderstandings, obtain advice and referral, and would suggest that a health promotion presence within such a venue is a useful mechanism for engaging with highly sexually active men.

Oral and anal sex are key to sustaining gonorrhoea at endemic levels in MSM populations: a mathematical model

OBJECTIVES

Despite early treatment of urethral infection, gonorrhoea is endemic in urban populations of men who have sex with men (MSM) in Australia. By contrast, gonorrhoea is not common in urban heterosexual populations. Sexual activities among MSM usually involve anal or oral sex, and as these behaviours are becoming increasingly common among heterosexuals, there is a need to investigate their roles in transmission of gonorrhoea.

METHODS

We developed individual-based models of transmission of gonorrhoea in MSM and heterosexuals that incorporate anatomical site-specific transmission of gonorrhoea. We estimated the probabilities of transmission for anal sex and oral sex by calibrating an MSM model against prevalence of gonorrhoea and sexual activity data. These probabilities were then applied to a heterosexual model in order to examine whether gonorrhoea can persist in a heterosexual population through the addition of anal sex and oral sex.

RESULTS

In the MSM model, gonorrhoea can persist despite prompt treatment of urethral infections. The probability of gonorrhoea persisting is reduced if use of condom for oral sex is increased to more than 15% of acts. Assuming that treatment of symptomatic infections is prompt, gonorrhoea is unlikely to persist in a heterosexual population even with the addition of anal and oral sex.

CONCLUSIONS

Our models suggest that oral sex has an important role in sustaining gonorrhoea in a population of MSM by providing a pool of untreated asymptomatic infection. The importance of anal sex or oral sex in sustaining gonorrhoea in a heterosexual population remains uncertain due to the lack of information linking different types of sex acts and transmissibility.

Rate of repeat diagnoses in men who have sex with men for Chlamydia trachomatis and Neisseria gonorrhoeae: a retrospective cohort study

Background Sexually transmissible infections (STIs) have increased rapidly among men who have sex with men (MSM). One of the most effective strategies to control STIs is partner notification. Inadequate partner notification may be associated with high rates of repeat diagnoses with STIs. The aim of this study is to estimate and compare the rate of chlamydia and gonorrhoea infection following primary infection to the overall clinic rate. Methods: A retrospective cohort analysis of MSM attending the Melbourne Sexual Health Clinic was conducted. For both infections, the overall incidence and that following diagnosis and treatment was calculated. Results: Of the 13053 MSM, the incidence of diagnoses for chlamydia and gonorrhoea was 8.5 (95% CI: 8.2–8.9) and 6.2 (95% CI: 5.9–6.5) per 100 person-years, respectively. Seventy per cent of chlamydia and 64% of gonorrhoea cases were retested at 10–365 days after diagnosis and treatment. Following diagnosis and treatment of chlamydia, the rate ratio in these individuals in the first quarter was 16- and 8-fold higher for chlamydia and gonorrhoea, respectively, compared with the background incidence of diagnoses. Similarly, following diagnosis and treatment of gonorrhoea, the rate ratio in these individuals in the first quarter was 18- and 10-fold higher for gonorrhoea and chlamydia, respectively. Conclusions: These data suggest that approximately half of MSM who test positive for chlamydia or gonorrhoea within 90 days after an initial infection represent contact with either a previous sexual partner or member of the same sexual network, the remainder representing the particularly high STI risk for these MSM.

Sexual behaviour and HIV prevention needs of men attending a suburban Sex on Premises Venue

Background Sexual behaviour and HIV prevention needs of men who have sex with men (MSM) attending suburban Sex on Premises Venues (SOPVs) are understudied. Methods: A cross-sectional survey examining sexual activity, health services utilisation, sexual health services needs and STI knowledge was conducted among MSM over 18 years old attending a SOPV in Western Sydney between June and July 2013. Results: A total of 213 MSM were sampled; approximately half of the respondents (51%) reported that they only had sex with other men, and 46% had sex with both men and women. Condom use varied considerably, with ~50% of responders not using condoms consistently during anal sex. Consistent condom usage was not associated with having regular, casual or a mix of regular and casual partners during anal sex (P = 0.09). The majority (59.5%) obtained sexual health screening services from general practitioners; only 15.0% sought services from a local sexual health clinic. Over half of respondents (57.7%) believed that SOPVs should offer on-site and free testing services. Those with the highest level of previous STI diagnoses were gay men (41%), those who only had casual partners (38%) and those who did not complete high school (65%). Conclusions: Sexual health services and non-government organisations should consider targeting bisexual men with rapid HIV testing and condom usage campaigns. Low cost or free on-site HIV and STI testing at SOPVs and stronger partnerships between general practitioners and sexual health services are needed.

A pilot study of HIV/STI risk among men having sex with men using erectile dysfunction medications: challenges and opportunities for sexual medicine physicians

INTRODUCTION

A growing literature suggests relationships between erectile dysfunction medications (EDM) and riskier sexual behavior among men who have sex with men (MSM). Questions remain concerning EDM use and related HIV/sexually transmitted infections (STI) risk among older MSM, particularly those 40 years and over, for whom EDM may be medically warranted.

AIM

This exploratory pilot study explores the relationship between EDM and risky sexual behavior in a convenience sample of MSM using EDM and attending historic sex-on-premises venues.

METHODS

We examined anonymous surveys from 139 MSM. Bivariate relationships were examined. We then fit a multiple logistic regression model to determine predictors of engaging in unprotected anal intercourse (UAI) at last EDM, using variables identified as being significantly related to UAI in the bivariate analyses. Potential predictors entered the model in a stepwise fashion.

MAIN OUTCOME MEASURES

The primary outcome measure was engaging in UAI at last EDM use.

RESULTS

MSM participating in the study ranged from 27 to 77 years and averaged 52.0 years (standard deviation = 10.73 years). These participants were primarily older MSM; fewer were younger MSM (12.12%), under age 40. Participants reporting UAI at last EDM use (N = 41) were significantly younger (P < 0.01). Men visiting bars within the last 6 months reported less UAI (P < 0.01). Both variables were independent predictors of UAI in the logistic regression model (P < 0.01).

CONCLUSIONS

Similar to reports from younger MSM, our findings suggest older MSM using EDM and reporting UAI are also recreational drug users. We include recommendations for urologists and other sexual medicine physicians treating MSM who may be at elevated risk for HIV/STI infection because of joint EDM and club drug use.

The difference in self-reported and biological measured HIV prevalence: implications for HIV prevention

In Australia, HIV prevalence estimates among gay men have been mainly based on self-reported HIV status collected in annual behavioural surveys. We measured biological HIV prevalence among gay men in Melbourne, Australia, using a facility based sampling method. We calculated HIV prevalence and used logistic regression to assess correlates of a positive HIV test. A total of 639 gay men were recruited completed a survey and provided oral fluid for HIV testing from seven venues in 2008. The median age of the participants was 35 years (range 18-75 years). Overall biological HIV prevalence was 9.5% (95% CI 7.5-12.0%) compared with 6.3% (95% CI 4.5-8.4%) for self-reported HIV positive status. We found a significant discrepancy between test detected biological and self-report HIV status in our study, with 19 men (31.1%) unaware of their HIV infection. These results highlight the importance of repeatable biological estimates to inform and evaluate HIV prevention strategies.

High rates of undiagnosed HIV infections in a community sample of gay men in Melbourne, Australia

Undiagnosed HIV infections contribute disproportionately to the HIV epidemic. We recruited 639 gay men attending social venues, who completed a cross-sectional survey with oral fluid collection for HIV testing in 2008. We calculated HIV and undiagnosed HIV prevalence and used χ(2) tests and logistic regression to examine associations between participant characteristics and HIV status. Among 639 men, 61 (9.5%, 95% confidence interval: 7.4% to 12.1%) tested HIV positive, of which 19 (31.1%, 95%confidence interval: 19.9% to 44.3%) were classified as undiagnosed HIV positive. Almost a third of HIV-positive men were unaware of their HIV status, and of these men, a large proportion engaged in high-risk behaviors.

Sex partying among gay men in Sydney, Melbourne and Brisbane, Australia

Group sex is relatively common among gay men, and is a likely risk factor for infection with HIV and other sexually transmissible infections (STI). The 5,432 participants in the 2008 Gay Community Periodic Survey in Sydney, Melbourne and Brisbane, Australia, were asked about their participation in group sex. Nearly half (44.0%) of those who reported sex with casual male partners in the previous 6 months also reported engaging in group sex. Among other factors, using drugs odds ratios (OR) and confidence intervals (CI) (OR = 1.89, CI = 1.61-2.21), being HIV-positive (OR = 1.62, CI = 1.13-2.32), and engaging in anal intercourse, both with a condom (OR = 3.03, CI = 2.46-3.73) and without a condom (OR = 5.68, CI = 4.53-7.12) were independently associated with having engaged in group sex. This study suggests that gay men who engage in group sex represent an important priority for targeted HIV and STI prevention activities and research.

Australian men's sexual practices in saunas, sex clubs and other male sex on premises venues

BACKGROUND

Sex on premises venues (SOPVs) where men have sex with men have been implicated in the spread of sexually transmissible infections, but few studies have described men's sexual encounters in SOPVs, particularly the degree to which men from different backgrounds engage in risky sexual practices.

METHODS

Interviewer administered surveys were conducted with 186 Australian men who have sex with men (MSM) within 48 h of visiting an SOPV. They reported their sexual practices, the characteristics of their partners and other circumstances surrounding their sexual encounters.

RESULTS

All analyses were based on the number of sexual encounters (n = 430). Oral sex was the most common practice, occurring in 74.9% of encounters, followed by massage, frottage or kissing (53.7%), solo or mutual masturbation (36.3%), and anal sex (32.1%). Multivariate analyses revealed age as a significant factor for having protected anal sex (P = 0.001), insertive anal sex (P = 0.004) and receptive anal sex (P < 0.001). These practices were more frequent in encounters among younger men, while masturbation (P = 0.03) was more frequent among older men. When men's sexual partners were affected by alcohol, encounters were less likely to involve unprotected anal intercourse (P = 0.006) and more likely to involve massage, frottage or kissing (P = 0.009). Men disclosed their HIV status in only 7.7% of encounters.

CONCLUSIONS

With the likelihood of risky sexual practices varying according to background, results from this study should be used to guide interventions aiming to promote safer sex in SOPVs.