Drawing the Line: The Development of a Comprehensive Assessment of Infidelity Judgments

What is Infidelity? A Vignette Study on Norms and Attitudes toward Infidelity

Infidelity is more than extradyadic intercourse, but it is unclear where infidelity begins and how behaviors are related to each other. We investigated data from a factorial survey experiment implemented in the German Family Panel (pairfam). 9,104 respondents evaluated 26,633 vignettes on unfaithful behaviors including four dimensions: explicit behavior, emotional involvement, infidelity duration, and erotic online contact. Results suggest that item lists may not reveal the full picture of unfaithfulness. While intercourse is judged as unfaithful irrespective of the context, less explicit behaviors such as kisses or hugs were also regarded as infidelity. Nonphysical dimensions contributed to infidelity judgments more strongly when less explicit behaviors were evaluated. Even cases of no physical contact combined with erotic text messages and emotional involvement were evaluated as unfaithful. Women's judgments were stricter than men's, and younger respondents' evaluations were stricter than those from older respondents. No differences were found regarding the gender of the vignette character.

Factors Affecting Online Infidelity: A Review

Online infidelity has been a topic of discussion for the past two decades. Hence, while it is on the agenda of current researches, the associated factors of online infidelity have not yet been sufficiently clarified. The current review examines factors affecting online infidelity in line with Preferred Reporting Items for Systematic Reviews and Meta-analysis guidelines. In the review the studies were included considering the criteria of (i) being an empirical study, (ii) being written in Turkish or English, (iii) being published in peer-reviewed journals (iv), evaluating at least one factor that may affect online infidelity. Eight studies which include factors affecting online infidelity were examined and the findings of these studies were evaluated. More positive attitudes towards infidelity, lower relationship commitment, higher quality of alternative partners, lower marital quality, higher loneliness, lower relationship satisfaction, higher relationship uncertainty, anxious and avoidant attachment, and being in a strong position were found significantly associated with online infidelity.

Motivation of non-monogamous adults to engage in sex with their different partners

This study compared motivations of individuals in non-monogamous relationships to engage in sex with their different partners (n = 596, out of which 103 non-consensual non-monogamous, 135 polyamorous, 204 swinging, 154 in open relationships; women—38.8%, men—59.7%, other gender—1.5%; age range: from 18 to 65+ years; 86% of respondents between 25 and 54 years old; majority of the respondents are in a long-term relationship). The research aim was to identify whether there are differences in reasons to engage in sex with respondents’ primary versus secondary partners. Presented with 17 reasons to engage in sexual activity, the respondents rated the frequency with which they engage in sex for each reason with their different partners. Questions for 14 reasons to engage in sex were created based on the YSEX? questionnaire and three questions were created specifically for non-monogamous population. The three new questions addressed the desire for a specific type of sex (such as kink, fetish, etc.), desire to have sex with a partner of another gender than one’s primary partner, and desire to experience the thrill of the forbidden. The results indicated that there are significant differences in motivation to engage in sex with one’s primary versus secondary partner for most of the reasons. Additionally, this study investigated whether there are differences in motivation to engage in sex with different partners depending on the relationship arrangement. The data analysis shows that there are differences in reasons to engage in sex with one’s different partners between non-consensually and consensually non-monogamous groups. This research compliments existing body of research with new reasons to engage in sex, it demonstrates that non-monogamous people engage in sex with their different partners for different reasons and reveals that these may vary depending on the type of the relationship arrangement.

Comparison of Indirect and Direct Approaches to Identifying an Unfaithful Partner

Infidelity has been operationalized inconsistently across studies, and measurement approaches have been employed that are not ideally suited for addressing the stigmatized and subjective nature of infidelity, thereby limiting the conclusions that can be drawn from this body of literature. In 2016, Thompson and O'Sullivan took a step toward addressing these shortcomings by implementing an indirect measurement approach. We extend their findings using a sample of 465 married and divorced individuals via MTurk. Substantially more participants reported having engaged in infidelity via the indirect approach than the direct approach, and results suggest that-in contrast to findings from direct questioning-similar percentages of men and women engage in self-defined infidelity. Implications for research and clinical practice are provided.

Is Infidelity Predictable? Using Explainable Machine Learning to Identify the Most Important Predictors of Infidelity

Infidelity can be a disruptive event in a romantic relationship with a devastating impact on both partners' well-being. Thus, there are benefits to identifying factors that can explain or predict infidelity, but prior research has not utilized methods that would provide the relative importance of each predictor. We used a machine learning algorithm, random forest (a type of interpretable highly non-linear decision tree), to predict in-person and online infidelity across two studies (one individual and one dyadic, N = 1,295). We also used a game theoretic explanation technique, Shapley values, which allowed us to estimate the effect size of each predictor variable on infidelity. The present study showed that infidelity was somewhat predictable overall and interpersonal factors such as relationship satisfaction, love, desire, and relationship length were the most predictive of online and in person infidelity. The results suggest that addressing relationship difficulties early in the relationship may help prevent infidelity.

Examining Variations in Participation and Outcomes of Consensual and Nonconsensual Extradyadic Behavior among Ashley Madison Users

Despite the abundance of studies investigating individual differences associated with extradyadic behavior (EB), nearly all have adopted retrospective measures in which the data is likely plagued by recall biases. In addition, few studies have explored individual differences or outcomes associated with EB between those with consenting and nonconsenting primary partners. Thus, the current study investigated the extent to which Ashley Madison users participated in a wide range of EBs, whether age, gender, and sexual identity predicted participation, and the extent to which outcomes were impacted by partner consent. The results from 1460 adults (962 men, 498 women) revealed that users reported engaging in three categories of behaviors: sexual/explicit, technology/online, and emotional/affectionate behaviors and that women and those older in age reported participating in EBs more frequently than men and those younger in age. Finally, 16.9% of the sample had a primary partner that consented to their Ashley Madison use and those with consenting partners reported greater perceived improvement in their primary relationship than did those with nonconsenting partners. Our findings highlight the importance of assessing the multitude of behaviors that Ashley Madison users participate in and whether consent was obtained. Implications for educators and practitioners are discussed.

Infidelity treatment from an integrative behavioral couple therapy perspective: Explanatory model and intervention strategies

Infidelity has a devastating effect on relationships and is a common reason for seeking couple therapy. However, few empirical studies have demonstrated effective models or strategies for treating this issue. An exception is integrative behavioral couple therapy (IBCT). Nevertheless, IBCT's specific contributions to this therapeutic problem have not been the main focus of any publication. This article briefly mentions the effects that infidelity has on intimate partner relationships and presents the empirical evidence for IBCT's utility in treating affairs. It places special focus on exploring infidelity using IBCT's explanatory model. The application of various IBCT strategies and techniques in infidelity cases is explained both in general and with concrete examples. Whether couple therapy in cases of infidelity should focus specifically on the affair or on a wider scope of issues is discussed, as well as new directions for infidelity research within an IBCT framework.

Simmering on the Back Burner or Playing with Fire? Examining the Consequences of Back-Burner Digital Communication Among Ex-Partners

Back burners are people with whom one communicates to potentially establish a future romantic or sexual relationship, and these relationships are common among college students. Using a sample of noncollege adults currently in committed relationships (N = 246) obtained via Amazon's MTurk, this study examines how a prior relationship role with a desired back burner (i.e., whether a back burner was an ex-partner or not) affects digital communication and sexual activity with back burners, and participants' negative affect. Sequential mediation analysis revealed that when the most-desired back burner was also an ex-partner (vs. not), participants digitally communicated more, increased communication was positively related to sexual activity with that back burner, and sexual activity was associated with negative affect in the participant. Even in the absence of sexual activity, both increased digital communication and simply having an ex-partner as one's most-desired back burner were associated with negative affect. Limitations and implications for staying in touch with ex-partners are discussed.

Validation of the Multidimensional Inventory of Infidelity (IMIN) in Colombian Population

Infidelity is a problem that entails psychological and physical consequences in humankind (Buss, 2016; González et al., 2009; Shackelford et al., 2003); thus, indicating the importance of measuring infidelity construct. The objective of the study was to determine the validity and reliability of the Multidimensional Infidelity Inventory (IMIN) for Colombian samples. For this, the instrument was applied to 674 Colombian participants, 224 men (33.28%) and 449 women (66.71%), with ages between 18 and 81 years (M = 25.11; SD = 10.56), carrying out exploratory factor analysis, confirmatory, and internal consistency for each subscale. In general, in the Motives to infidelity scale, three factors were found that explained 66.74% of the total accumulated variance; three factors were found in the Trend to Infidelity scale, explaining 65.02% of the total variance; in the sub-scale of Beliefs to infidelity, five factors were obtained, explaining 58.33% of the accumulated variance; and in the sub-scale of Consequences of infidelity, two clearly constituted factors were found, which explain 57.58% of the accumulated variance. All of them had confirmatory models with adequate levels of goodness of fit, adequate Cronbach alpha indicators, item-item, and item-test correlations, in addition to concordance with the original proposal of the instrument.

The Webs We Weave: Predicting Infidelity Motivations and Extradyadic Relationship Satisfaction

The current study examined relationships between sociosexual constructs and motivations for infidelity in a currently cheating sample. Members of the AshleyMadison.com website who were actively using the website to search for and/or engage in infidelity completed a brief anonymous online survey. Our findings supported previous research regarding emotional and sexual motivations for infidelity. However, we also found that various individual differences were connected to each type of motive. For example, sexual motivations for infidelity were best predicted by being male, having an unrestricted sociosexual orientation, experiencing less sex guilt, having greater Christian identification, and being less satisfied with the primary partner. Importantly, these were not the same patterns for each type of motivation (e.g., anger). Finally, participants' satisfaction with their secondary (i.e., infidelity) partners was not consistently predicted by the motivations for infidelity. This suggests that an individual-differences approach to predicting issues related to infidelity is an important approach for future research.

What Do People Do, Say, and Feel When They Have Affairs? Associations between Extradyadic Infidelity Motives with Behavioral, Emotional, and Sexual Outcomes

In this study, we surveyed a sample of U.S. undergraduates and internet-based participants (N = 495) about their experiences during/after romantic infidelity (affairs), and their initial motivations to engage in infidelity. Meaningful associations emerged between motivation and experience variables. Dyadic motivations (e.g., anger at one's partner, lack of love) were linked with longer affairs, more public dates with affair partners, and primary relationship dissolution. Conversely, non-dyadic situational motivations (e.g., feeling stressed or intoxicated) were linked with shorter affairs, less satisfying sex during affairs, and lower rates of disclosure and dissolution. These findings suggest meaningful infidelity typologies and may aid researchers and practitioners in helping others resolve relational conflicts.

Don´t cheat like I did: Possessive jealousy and infidelity in close relationships

In a sample of 68 adult men and 70 adult women from Santiago, Chile, with a mean age of 29.40 years and a median age of 29, the effects of one's own infidelity and that of one's partner on different types of jealousy were examined. Of the respondents 47.1% had ever been unfaithful, and over half (56.5%) reported that their partner had been unfaithful. There were no effects of one's own infidelity and that of one's partner on reactive and anxious jealousy, but those who had been unfaithful, as well as those whose partner had been unfaithful, expressed the highest levels of possessive jealousy. These effects were not moderated by gender nor did age affect jealousy. Women were higher in all types of jealousy than men were.

Sexual Transgressions in Couples: The Influence of Dependence and Commitment on their Perception and Handling

Transgressions occur frequently in romantic relationships, and how they are perceived is influenced by the type of transgression that occurred. By means of an experimental study of 399 participants (75.9% women and 24.1% men) aged 18 to 64 years old (Mage = 31.20, SD = 10.48), we examined the relationship between the type of sexual transgression (infidelity versus coercion), and perceived severity, strategies individuals would use in response to the transgression, and the probability they would leave the relationship, as well as levels of dependence and commitment. Results revealed higher perceived severity (p < .001, η2p = .24) and probability of leaving the relationship (p < .001, η2p = .39) in the infidelity scenario (versus coercion). Meanwhile, women (compared to men) rated sexual transgressions as more severe (p < .001, η2p = .04) and reported a higher probability of leaving the relationship (p < .001, η2p = .03), as well as a higher use of active conflict resolution strategies (exit, p = .048, η2p = .01, and voice, p < .001, η2p = .06) and lower use of passive strategies (loyalty, p < .001, η2p = .08). Finally, high levels of commitment and dependence predicted lower perceived severity (commitment, p < .001, 95% CI [-.72, -.20]; dependence, p < .001, 95% CI [-1.73, -.85]) and lower probability of leaving the relationship (commitment, p = .048, 95% CI [-.55, -.01]; dependence, p < .001, 95% CI [-1.66, -.73]) in coercion (versus infidelity) transgressions. These results highlight the normalization of sexual coercion in romantic relationships, which is not viewed as negatively as infidelity, and that commitment and dependence contribute to minimizing the negative impressions of it.

Sanctification and Cheating Among Emerging Adults

Cheating-a general term for extradyadic romantic or sexual behavior that violates expectations in a committed romantic relationship-is common and leads to a number of poor outcomes. Religion has historically influenced conceptions of romantic relationships, but societal attitudes about religion are in flux as many seek to retain spirituality even as affiliations with formal religion decrease. The present study evaluated a potential predictor of cheating that is more spiritual than formally religious, the "psychospiritual" concept of relationship sanctification (i.e., the idea that one's relationship itself is sacred). In a sample of college students in committed relationships (N = 716), we found that higher levels of self-reported relationship sanctification were associated with a lower likelihood of both physical and emotional cheating even when accounting for plausible alternate explanations (general religiosity, problematic alcohol use, and trait self-control). This association was mediated via permissive sexual attitudes; specifically, higher levels of sanctification were associated with less permissive sexual attitudes which, in turn, predicted a lower likelihood of emotional and physical cheating.

Once a Poacher Always a Poacher? Mate Poaching History and its Association with Relationship Quality

Successful mate poaching is a form of infidelity that occurs when one partner knowingly attracts the mate of another with the intention of starting a sexual and/or romantic relationship with this individual. Relationships formed from poaching tend to be of lower quality than their non-poached counterparts. A history of poaching might reflect a sociosexuality that propels seeking new partnerships without regard for exclusivity. It is unknown whether serial poaching for relationship formation is linked to more permissive sociosexual orientation. Adults (N = 653; aged 25-40; 57% women) in a romantic relationship completed online surveys assessing mate poaching, poaching history, sociosexuality, and relationship quality (commitment, satisfaction, trust, jealousy). Those in a poached relationship at the time of the study had a more extensive history of poached relationships and a more permissive sociosexuality. Participants who reported a more extensive history of mate poaching reported poorer quality relationships. The link between poaching history and relationship quality was partially accounted for by sociosexuality. This research adds to our understanding of difficulties that may be associated with the relationships of individuals who use poaching as a relationship initiation strategy, and the challenges that permissive sociosexuality may present for maintaining long-term relationships.

Walk the Line: How Successful Are Efforts to Maintain Monogamy in Intimate Relationships?

Monogamy, typically defined as sexual and romantic exclusivity to one partner, is a near-universal expectation in committed intimate relationships in Western societies. Attractive alternative partners are a common threat to monogamous relationships. However, little is known about how individuals strive to protect their relationships from tempting alternatives, particularly those embedded in one's social network. The current exploratory study was guided by the Investment Model, which states that satisfaction, investments, and perceived alternatives to a relationship predict commitment, which in turn predicts relationship longevity. The study aimed to identify relationship and extradyadic attraction characteristics associated with monogamy maintenance efforts, specifically relationship commitment, as predicted by the Investment Model. The efficacy of monogamy maintenance efforts was assessed via sexual and emotional infidelity measures at a 2-month follow-up. U.S. adults in heterosexual intimate relationships (N = 287; 50.2% male; M age = 34.5 years; M relationship length = 87 months) were recruited online to complete the survey study. Through structural equation modelling, the Investment Model structure was replicated, and relationship commitment predicted use of relationship-enhancing efforts as well as self-monitoring/derogation efforts. Individuals who experienced reciprocated attraction used significantly more avoidance and self-monitoring/derogation efforts than did those who experienced unreciprocated attraction. Ultimately, monogamy maintenance efforts did not significantly predict success in maintaining monogamy at follow-up. These findings have important research, educational, and clinical implications relating to relationship longevity.

Sexting outside the primary relationship: Prevalence, relationship influences, physical engagement, and perceptions of “cheating”

Research has not yet investigated the frequency of sexting outside of a primary relationship. Research consistently shows that most sexting occurs within the context of a relationship, but few studies have taken relationship status into account. Additionally, limited research has investigated if sexting is considered infidelity. This study aims to fill those gaps by examining sexting outside of the primary relationship. University students and community members were asked about their sexting activities outside of their primary relationship using an online questionnaire. Results indicate that 23% of participants have sexted outside of their relationship. Those who cohabitate with their primary partner or are in a non-monogamous relationship are more likely to sext with a secondary partner. The majority of people who sext outside of their relationship do so with five or less partners and do so less than once a month, indicating that sexting outside of the primary relationship is infrequent. Seventy-five percent of those that sexted secondary partners considered this act cheating. Lastly, 36% also engaged in face-to-face sexual activity with the secondary partners they sexted. The importance of considering relationship status variables in understanding sexting and infidelity is discussed.

Trust, Sexual Trust, and Sexual Health: An Interrogative Review

Trust is experienced almost constantly in all forms of social and interpersonal relationships, including sexual relationships, and may contribute both directly and indirectly to sexual health. The purpose of this review is to link three aspects of trust to sexual health: (1) the role of trust in sexual relationships; (2) the role of trust in sexually transmitted infection (STI) prevention, particularly condom use; and (3) the relevance of trust in sexual relationships outside of the traditional model of monogamy. The review ends with consideration of perspectives that could guide new research toward understanding the enigmas of trust in partnered sexual relations in the context of sexual and public health.

Unforgiveness Motivations in Romantic Relationships Experiencing Infidelity: Negative Affect and Anxious Attachment to the Partner as Predictors

Infidelity is considered an unforgivable betrayal. However, not all behaviors considered unfaithful affect the person who suffers them in the same way. Therefore, to have a better understanding of unforgiveness according to different extradyadic behaviors, two studies were designed. Study 1 (N = 240) explored which extradyadic behaviors are considered as more indicative of infidelity. The results revealed that sexual behaviors were considered more unfaithful when compared with technological, emotional/affective, and solitary behaviors. Study 2 (N = 378) examined the influence of experienced extradyadic behaviors on unforgiveness, negative affect, and anxious attachment to the partner. The results showed that (a) sexual and technological behaviors were less frequently forgiven and promoted a more intense negative affect, (b) anxious attachment was predictive of unforgiveness for sexual and technological behaviors, and (c) negative affect mediated the relationship between anxious attachment and unforgiveness for sexual and technological behaviors. These findings and their possible implications for romantic relationships are discussed.

Motivations for Extradyadic Infidelity Revisited

Relationship infidelities are motivated by many distinct factors, with previous research indicating motivations of dissatisfaction, neglect, anger, and sexual desire (Barta & Kiene, 2005). We expand on this by demonstrating additional, empirically distinct motivations for infidelity. Using an Internet-based questionnaire, participants (N = 495), most of whom were young adults, self-reported their infidelities. In addition to evidence for previously studied motivations, our data demonstrate additional factors, including lack of love ("I had 'fallen out of love with' my primary partner"), low commitment ("I was not very committed to my primary partner"), esteem ("I wanted to enhance my popularity"), gaining sexual variety ("I wanted a greater variety of sexual partners"), and situational factors ("I was drunk and not thinking clearly"). Our results also show personality correlates with infidelity motivations. Consistent with predictions, attachment insecurity was associated with motivations of anger, lack of love, neglect, low commitment, and esteem, while unrestricted sociosexual orientation was associated with sexual variety. Implicit beliefs (e.g., growth, destiny, romanticism) were differentially associated with sexual desire, low commitment, lack of love, and neglect. These findings highlight multifaceted motivations underlying infidelity, moving beyond relationship deficit models of infidelity, with implications for research and psychotherapy involving people's romantic and sexual relationships.

Stepping into their shoes: Reducing the actor-observer discrepancy in judgments of infidelity through the experimental manipulation of perspective-taking

The goal of the current study was to examine whether perspective-taking could be an effective method for reducing the actor-observer bias seen in judgments of infidelity. Specifically, 708 adults judged the extent to which 32 behaviors were indicative of infidelity after being assigned to one of nine conditions in which the person engaging in infidelity (actor, partner, stranger) and the perspective-taking instructions (perspective-taking, stay objective, no instructions) were manipulated. Overall, the actor-observer and perspective-taking manipulations significantly affected judgments of the technology/online and solitary forms of infidelity. Adults in the perspective-taking condition judged their partner's and a stranger's technology/online behaviors as less indicative of infidelity than their own and their partner's solitary behaviors as more indicative of infidelity than their own or a stranger's. These results indicate that perspective-taking impacts infidelity judgments but only for certain behaviors. Implications and recommendations are outlined for clinicians and researchers working with and studying romantic couples.

Love thy neighbour: Personality traits, relationship quality, and attraction to others as predictors of infidelity among young adults

Infidelity is defined as the violation of a couple's assumed or stated agreement concerning emotional and/or sexual exclusivity. The current study examined the utility of personality traits (i.e., the Big Five and SIS/SES - an individual's sexual response to sexual desires, arousal, and behaviours are based on the balance between sexual excitation and sexual inhibition; Bancroft & Janssen, 2000) relative to relationship quality and attraction to others in predicting reports of infidelity among a sample of young adults (ages 18–26 years). A total of 131 men and 164 women from the US who reported being in a romantic relationship were recruited using MTurk®, an online crowdsourcing survey tool. Participants completed a series of measures assessing demographics, relationship quality and investment, sexual experience, sexual attitudes, attraction to others, and personality traits, including the Big Five and SIS/SES. A notable minority (16.6%) of participants reported at least one occasion of past infidelity during their current romantic relationship (yes/no reports); however, reports of infidelity increased significantly when individuals reported actual sexual, romantic, and online infidelity activities (78.6%). Personality traits within the Big Five and SIS/SES models were not significant predictors of infidelity. With each occurrence of emotional attraction to a person other than their current partner, the odds of reporting infidelity increased by 51.6%. The findings are discussed in terms of implications for counselling and education regarding infidelity, as well as continued research on risk factors for infidelity among young adults.