Translation and validation of the Portuguese version of the Sexual Desire Inventory-2: assessing gender differences

Masturbation parameters: their relation to sexual arousal in young people who engage in same-sex relationships

Background

Interest in masturbation in sexual orientation and gender diversity research are rather limited. Extending this research field to include this type of population by considering different masturbation parameters is necessary. In this respect, various masturbation parameters (i.e., negative attitudes toward masturbation, solitary sexual desire, current masturbation frequency, subjective orgasm experience) were validated in a laboratory study with different measures of sexual arousal in persons who engage in same-sex relationships.

Aim

Our main aim was to provide evidence to support the validity of the different masturbation parameters in young people who engage in same-sex relationships. The association between masturbation parameters and various sexual arousal measures (genital response, rating of sexual arousal and rating of genital sensations) was analyzed.

Methods

During a lab task, 72 young adults who engaged in same-sex relationships (36 women, 36 men; age range: 18-32 years) watched content-neutral and sexually explicit films. They included scenes of self-exploration and solitary masturbation behaviors performed by individuals of the same sex as the participants. Negative attitudes toward masturbation, solitary sexual desire, current masturbation frequency, dimensions of subjective orgasm experience in the solitary masturbation context (i.e., affective, sensory, intimacy, rewards), propensity for sexual excitation, genital response (i.e., penile circumference and vaginal pulse amplitude), rating of sexual arousal and rating of genital sensations were assessed. Regression models were conducted to explain the arousal measures with masturbation parameters.

Results

In women, the intimacy dimension of the subjective orgasm experience in masturbation (β = 0.42, p = 0.007) and solitary sexual desire (β = 0.32, p = 0.040) predicted the rating of sexual arousal by explaining 24.1% of its variance. Conversely for men, the rewards dimension of the subjective orgasm experience in masturbation (β = 0.40, p = 0.016) significantly predicted genital response and explained 13.4% of its variance.

Conclusion

Our findings validate some examined masturbation parameters (specifically solitary sexual desire and subjective orgasm experience) in young adults who engage in same-sex relationships. Gender differences in the masturbation parameters were observed for the relevance of these masturbation parameters for explaining sexual arousal. These findings support the relation between masturbation and sexual function.

The Mediating Role of Sexual Boredom in Women's Sexual Desire and Satisfaction

Sexual boredom in women is associated with various levels and dimensions of sexual desire, as well as lower sexual and relationship satisfaction. However, the directionality of these relationships remains unclear. This study aimed to investigate whether sexual boredom mediates the relationship between partner and attractive-other sexual desire and sexual and relationship satisfaction in a sample of 1155 Portuguese women in long-term monogamous relationships. Participants, aged 18-66 years (M = 31.60, SD = 5.65), were involved in cohabiting relationships of 1 year or more. Linear regression analysis and Structural Equation Modeling were conducted, revealing that sexual boredom emerged as a stronger predictor of sexual and relationship satisfaction compared to dimensions of sexual desire. Additionally, sexual boredom partially mediated the relationship between partnered sexual desire and satisfaction and fully mediated the relationship between attractive other-related sexual desire and satisfaction variables. Notably, sexual boredom explained up to one-third of sexual satisfaction (32%) and slightly less of relationship satisfaction (27%). These findings underscore the importance of addressing sexual boredom in long-term relationships to promote women's sexual health. Furthermore, they suggest that experiencing sexual desire for attractive non-partners is not indicative of sexual and relationship dissatisfaction unless accompanied by sexual boredom.

Cross-Cultural Validation of the Sexual Desire Inventory (SDI-2) in 42 Countries and 26 Languages

Sexual desire is a complex construct with important implications for sexual functioning and well-being. In this research, we translated the Sexual Desire Inventory (SDI-2), a widely used scale for assessing sexual (desire), into 25 languages from English and used data from the International Sex Survey (ISS) to (a) investigate its psychometric properties (i.e. factorial structure, reliability, validity, and measurement invariance) and (b) explore the expression of sexual desire across different countries, genders, and sexual orientations. A total of 82,243 participants from 42 countries completed the SDI-2, along with other sexuality-related scales. Confirmatory factor analysis supported a three-factor solution for the SDI-2 (CFI = .980; RMSEA = .060), encompassing the domains of "Partner-related," "Attractive-person-related," and "Solitary" sexual desire. The reliability of the total score and subscales were excellent. Likewise, correlations with other sexuality-related variables were positive yet weak-to-moderate in effect size. Measurement invariance tests supported its use across countries, languages, genders, and sexual orientations. Analysis of SDI-2 scores according to these variables supported its ability to capture group-based differences in sexual desire. In sum, the SDI-2 constitutes a psychometrically robust measure for the assessment of sexual desire in non-clinical samples with utility in large-scale cross-cultural studies.

Validation of Brazilian Version of the Sexual Desire Inventory 2 (SDI-2)

Objective

To traslate and validate of the Brazilian version of the SDI-2.

Methods

This was a cross-sectional study. The cultural adaptation considered the stages of initial translation, synthesis of translations, evaluation by a committee of experts from different regions of Brazil, back-translation, and pre-test. The content validity and psychometric proprieties was assessed.

Results

Ten specialists participated in the cultural adaptation of the SDI-2. The content validity showed a Content Validity Ratio (CVR) ≥ 0.75 (p = 0.05). A total of 674 subjects participated in the field study. The Exploratory Factorial Analysis (EFA) presented factor loads ≥ 0.445, and commonalities ≥ 0.40; and two dimensions represented 77% of the total variance explained. The Confirmatory Factorial Analysis CFA presented X 2/df = 4.265; the Root Mean Square Error of Approximation RMSEA = 0.110; the Non-Normed Fit Index NNFI = 0.946; the Comparative Fit Index (CFI) = 0.963; the Goodness of Fit Index GFI = 0.986; and the Adjusted Goodness of Fit Index AGFI = 0.979 for a two-factor model. The coefficient values for the total SDI-2 score were 0.91 for Cronbach's alpha, 0.91 for McDonald's Omega, and 0.97 for the Greatest Lower Bound GLB coefficients. The invariance between sexes was 0.01 for the ΔCFI and ΔRMSEA, showing model stability for these two populations.

Conclusion

The Brazilian version of the SDI-2 is self-report, valid, reliable and invariant across sex.

The Turkish Version of the Sexual Interest and Desire Inventory-Female (SIDI-F): Examination of the Validity, Reliability and Factorial Structure

The aim of this study is to investigate the validity and reliability of the Turkish version of the Sexual Interest and Desire Inventory-Female (SIDI-F). This methodological study was conducted with 268 women who met the sampling criteria between January and February 2024. Validity analysis was performed using the content validity index, convergent and divergent validity, exploratory factor analysis, and confirmatory factor analysis. Pearson product-moment correlation and Cronbach Alpha reliability coefficients were used for reliability analysis. To evaluate invariance of the inventory over time, test-retest measurements were conducted three weeks apart and showed no difference in mean scores (p > .05). Corrected item-total score correlations ranged from 0.303 to 0.846 in the positive direction and were statistically highly significant. Adjusted goodness-of-fit index > 0.85 and comparative fit index > 0.90 confirmed the construct validity of the Turkish SIDI-F. The Cronbach Alpha was found to be .88, indicating high internal consistency. The Turkish version of SIDI-F can be used as a measurement tool to determine the level of sexual interest and arousal.

Validity of the Brazilian online version of the Sexual Desire Inventory 2

OBJECTIVE

The Sexual Desire Inventory 2 is a self-report instrument for assessing sexual desire in men and women. In Brazil, there is no validated sexual desire self-report for the adult population. The aim of this study was to determine the evidence of validity for the content and construct of the Brazilian online version of the Sexual Desire Inventory 2.

METHODS

This was a cross-sectional study with Brazilian men and women. The sample size was calculated using the criterion of more than 20 participants per item. The invitation to participate in the study was conducted online by the platform Survey Monkey®. The Sexual Desire Inventory 2 was evaluated for content, construct, reliability, and invariance.

RESULTS

A total of 818 female and male adults participated in the study. The two-dimensional factorial solution represented 71% of the total variance explained by the model, and the factorial loads of the model were ≥0.40; commonalities presented values ≥0.23. Reliability was measured by the coefficients of Cronbach's alpha with a total score of 0.87, McDonald's of 0.87, Omega, and greatest lower bound with a total score of 0.95. The metric invariance was tested for the sex variables ΔCFI (comparative fit index) and ΔRMSEA (root mean square error of approximation) with a total score of 0.01.

CONCLUSION

The analyses indicate evidence of robust validity in the Brazilian online version of the Sexual Desire Inventory 2.

Measuring Sexual Motivation as a Trait Dimension: A multisample study of the Portuguese (European) Version of the Trait Sexual Motivation Questionnaire

The current study aimed at translating and validating the TSMQ into Portuguese-European (TSMQ-PT) and to investigate its psychometric properties. Three online studies were conducted with independent samples collected between September 2020 and March 2022. Study 1 tested the exploratory factorial structure (N = 325; 206 women); Study 2 explored the confirmatory factorial structure and construct validity (N = 450; 230 women); and Study 3 examined the temporal stability of the TSMQ-PT (N = 30; 15 women). Participants completed the TSMQ-PT for all three studies. In study 2, further completed the Sexual Compulsivity Scale, the Sexual Sensation Seeking Scale, and the Sexual Desire Inventory. Data revealed that the TSMQ-PT yielded a four-structure model, (i.e., Sexually Oriented, Comparison with Others, Seeking for Sexual Encounters, and Importance of Sex) comprising 13 items, with seven additional items for assessing existence and number of sexual partners, and frequency of sexual behaviors. The TSMQ-PT achieved good internal consistency levels (McDonald's omega ranged from .71 to .89) and construct validity, and temporal stability over 10-11 months (values ranged from .80 to .87) supporting the trait-dimension of sexual motivation. Current findings support a brief, valid, and reliable self-report instrument for assessing sexual motivation in the Portuguese context.

Solitary Sexual Desire: Its Relation to Subjective Orgasm Experience and Sexual Arousal in the Masturbation Context within a Spanish Population

The tridimensional sexual desire proposal (i.e., dyadic to partner, dyadic to attractive other and solitary) has been empirically supported. However, solitary sexual desire and its relationship to other dimensions of sexual functioning has received less attention. Hence, we examined the capacity of solitary sexual desire to explain the subjective orgasm experience (Study 1) and sexual arousal (Study 2) in the context of solitary masturbation. Study 1, composed of 2406 heterosexual adults (M age = 39.72, SD = 11.81), assessed for solitary sexual desire, dyadic sexual desire, and the intensity of the subjective orgasm experience obtained through solitary masturbation, along with other associated parameters. Study 2, consisting of 41 heterosexual young people (M age = 22.49, SD = 3.17), evaluated the genital response (penile circumference/vaginal pulse amplitude) and subjective arousal to sexually explicit films related to solitary masturbation. In both men and women, solitary sexual desire accounted for a significant percentage of the subjective orgasm experience obtained through solitary masturbation. In addition, in women, the propensity for sexual arousal was explained by solitary sexual desire. It is concluded that solitary sexual desire -as opposed to dyadic- is important to explain sexual arousal and orgasm in the solitary masturbation context. These results highlight the importance of addressing sexual desire in the solitary context, given its implications with other dimensions of sexual functioning.

Sexual boredom and sexual desire in long-term relationships: a latent profile analysis

BACKGROUND

Research suggests a general link between sexual boredom and sexual desire, but its understanding is currently very limited.

AIM

To identify distinct (latent) groups of women and men in long-term relationships based on their reported levels of sexual boredom and sexual desire.

METHODS

Latent profile analysis (LPA) was conducted in an online sample of 1223 Portuguese participants aged 18 and 66 years (mean ± SD, 32.75 ± 6.11), using indicators of sexual boredom and partner-related, attractive other-related, and solitary sexual desire to categorize participants. Multinomial logistic regression analysis was carried out to explore predictors and correlates of the latent profiles.

OUTCOMES

Sexual boredom was assessed by the Sexual Boredom Scale, while sexual desire was measured with the Sexual Desire Inventory.

RESULTS

As compared with women, men reported higher levels of sexual boredom and sexual desire. LPA indicated 3 profiles in women and 2 profiles in men. Among women, P1 was characterized by above-average sexual boredom, below-average partner- and attractive other-related sexual desire, and very low solitary sexual desire; P2 by below-average sexual boredom, attractive other-related sexual desire, and solitary sexual desire and above-average partner-related sexual desire; and P3 by above-average sexual boredom, attractive other-related sexual desire, and solitary sexual desire and below-average partner-related sexual desire. In men, P1 was characterized by high sexual boredom, above-average partner-related sexual desire, and high attractive other-related and solitary sexual desire and P2 by below-average sexual boredom and above-average partner-related, attractive other-related, and solitary sexual desire. The latent profiles did not differ according to relationship duration. Overall, the sole consistent correlate of the latent categorization was sexual satisfaction.

CLINICAL IMPLICATIONS

In women, above-average levels of sexual boredom were linked to below-average levels of partner-related desire, which suggests likely benefits of helping the couple to minimize or cope better with their sexual routines. In men, participants in the 2 profiles did not differ in partner-related sexual desire, suggesting that clinical interventions dealing with male sexual boredom should investigate factors beyond the current relationship.

STRENGTHS AND LIMITATIONS

This study explored different facets of sexual desire and used LPA, rendering advantages over previous research. The male sample has lower statistical power than the female sample.

CONCLUSION

Patterns of sexual boredom and sexual desire among individuals in long-term monogamous relationships are distinct and consistently related to sexual satisfaction in women and men and to relationship satisfaction among only women, which have important clinical ramifications.

A Learning Experience? Enjoyment at Sexual Debut and the Gender Gap in Sexual Desire among Emerging Adults

Gender differences in experience of first intercourse are among the largest in sexuality research, with women recalling less pleasure and satisfaction than men. This "enjoyment gap" has not been considered in explanations of gender differences in sexual desire. Yet, reinforcement and incentive learning feature prominently in recent models of women's sexual desire, and nonhuman animal models demonstrate their impact at sexual debut. We examined whether women's lower sexual desire is explained by their gender or by gendered experience of enjoyment at sexual debut. Emerging adults (N = 838) provided retrospective accounts of physical (orgasm) and affective (satisfaction) enjoyment at (hetero)sexual debut. We replicated gender differences across behavioral, general, and multidimensional measures of trait sexual desire; however, they were contingent on experience and measurement method. When its cognitive multidimensional properties were appreciated, women's sexual desire varied with experience of orgasm at sexual debut and diverged from men's only when orgasm did not occur. Such effects were not observed for satisfaction, nor for men. Nor did effects of a control event - masturbatory debut - extend beyond solitary sexual desire. Findings underscore the importance of orgasm equality, and suggest its absence at sexual debut may play an unacknowledged role in differentiating sexual desire.

Solitary and Dyadic Sexual Desire and Sexual Satisfaction in Women With and Without Sexual Concerns

Women's sexual difficulties have been associated with sexual-related dimensions. The present study aims to analyze the differences between women with and without sexual concerns, according to the Female Sexual Functioning Index cutoff score, on dyadic and solitary sexual desire and sexual satisfaction dimensions. A total of 314 women participated in the study and answered to a sociodemographic screening, to the Sexual Desire Inventory - 2, to the Female Sexual Functioning Index, and to the Sexual Satisfaction Scale for Women. Main findings showed that women with sexual concerns revealed lower levels of global sexual desire and partner-related sexual desire, experienced lower levels of communication and compatibility with sexual partner, and have more personal and relational sexual concerns. Overall, results enhance the role of dyadic and relational dimensions that allow to differentiate between women with and without sexual concerns. Clinical implications are discussed.

Masturbation parameters related to orgasm satisfaction in sexual relationships: Differences between men and women

OBJECTIVE

Masturbation is a behavior that can enhance sexual functioning. This study aims to analyze differences between men and women in different masturbation parameters, and to examine their relation with orgasm satisfaction in sexual relationships.

METHOD

One thousand three hundred and thirty-fifth men and women from the Spanish population aged 18-83 years (M = 36.91; SD = 11.86) participated in an online survey. A questionnaire was used to collect socio-demographic. Sexual history data, negative attitude toward masturbation, solitary sexual desire and orgasm subjective experience upon masturbation were assessed. Given the differences between men and women, independent regression models are proposed to explain orgasm satisfaction in the sexual relationships context.

FINDINGS

Men, compared to women, masturbated at a younger age (p < 0.001), and reported higher current masturbation frequency (p < 0.001) and more solitary sexual desire (p < 0.001). Women reported greater intensity in the subjective orgasm experience on its Affective (p < 0.001), Sensory (p < 0.001) and Intimacy (p < 0.001) dimensions. Regarding regression models, the Affective dimension of orgasm was a common parameter in men (β = 0.36; p < 0.001) and women (β = 0.24) to explain orgasm satisfaction during sexual relationships. In men, solitary masturbation frequency (β = -0.10; p = 0.027) acquired a significant role. In women, the model also included age (β = 0.09; p = 0.038), negative attitude toward masturbation (β = -0.12; p = 0.005) and solitary sexual desire (β = -0.19; p = 0.001).

CONCLUSION

When dealing with men and women's orgasm difficulties in the sexual relationships context, it is important to consider the role of masturbation. In men and women, the Affective dimension of the orgasm experience explain the orgasm satisfaction in sexual relationship. Also, in men, the solitary masturbation frequency is negatively related with orgasm satisfaction in sexual relationship, supporting the compensatory hypothesis of masturbation. In women, in addition to the Affective dimension, the orgasm satisfaction in sexual relationship is explained, negatively, by the negative attitude toward masturbation, and positively, by the solitary sexual desire, which could be associated with more sexual self-knowledge. The relevance of masturbation in understanding sexual functioning is highlighted.

Sexual Satisfaction, Solitary, and Dyadic Sexual Desire in Men According to Sexual Orientation

Research on male sexual desire and satisfaction according to sexual orientation remains insufficient. An online survey was fulfilled by 415 men (142 gay; 273 heterosexual), and participants completed the SDI-2 and the GMSEX. Main findings suggested that gay men scored significantly higher on both solitary sexual desire and attractive person-related dyadic sexual desire subscales, but not on a partner-related dyadic sexual desire subscale, compared to heterosexual men. Despite sexual orientation, partner-related dyadic sexual desire positively predicts sexual satisfaction, whereas solitary and attractive person-related dyadic sexual desire negatively predicts sexual satisfaction in men. Overall, gay men appear to experience higher levels of both attractive person-related dyadic and solitary sexual desire. Also, experiencing sexual desire toward a partner predicts positively, whereas experiencing desire to engage in sexual behavior with oneself and toward an attractive person predict negatively sexual satisfaction in men.