Men still report higher rates of infidelity than women in most large surveys, but the gap has been shrinking for decades and may be smaller than the raw numbers suggest. Much of the apparent difference traces not to some deep-seated male tendency but to factors like social power, economic independence, and the well-documented reality that men and women lie about sex in systematically different directions. When researchers control for things like professional status and opportunity, the gender difference in cheating sometimes vanishes entirely.
What the Surveys Actually Show
The most commonly cited data on American infidelity comes from the General Social Survey, which has tracked self-reported extramarital sex since the early 1990s. In recent waves, roughly 20 percent of married men and about 13 percent of married women say they have had sex with someone other than their spouse while married. That gap has been a fixture of infidelity research for years. But those numbers rest on people telling the truth in an interview, and there is good reason to think they do not.
Social desirability bias is the tendency to give answers that match what your culture expects of you, and it hits sexual behavior surveys especially hard. A review of this phenomenon found that misreporting in self-reported sexual behavior is “pervasive and often extreme,” with people over-reporting behaviors their culture approves of and under-reporting ones it condemns.1PubMed Central. The Influence of Social Desirability on Sexual Behavior Surveys: A Review For infidelity, this cuts in opposite directions for men and women. Research in Malawi, where sexual dynamics have been studied under different interview conditions, found that men exaggerated their sexual experience with traditional partners during face-to-face interviews while underreporting encounters with stigmatized partners. When interviews were computerized and private, the numbers shifted.2PubMed Central. Social Desirability Bias in Sexual Behavior Reporting: Evidence from an Interview Mode Experiment in Rural Malawi The implication is straightforward: in cultures that treat male sexual conquest as a status marker and female infidelity as shameful, men may inflate and women may conceal. The true gap is almost certainly narrower than surveys report.
Power Predicts Cheating Better Than Gender Does
One of the more striking findings in infidelity research comes from a large survey of over 1,500 working professionals. The study found that having more power in your professional life was positively associated with both actual infidelity and the intention to cheat in the future. The reason was not complicated: power made people more confident they could attract new partners. The critical detail is that gender did not change this relationship at all. The link between power and infidelity was the same for women as for men, and operated through the same psychological mechanism. The researchers argued that the common finding of men cheating more is, at least partially, a reflection of the fact that men have historically held more powerful positions in society, not that men are inherently more prone to straying.3PubMed. Power increases infidelity among men and women
This reframes the question in a useful way. Instead of asking whether men or women are more likely to cheat by nature, it suggests we should be asking who has more opportunity and social license. As women have gained professional power and financial independence over the past few decades, the infidelity gap has narrowed in tandem. The variable that matters most may not be what is between your legs but what is on your business card.
Money, Breadwinning, and Who Strays
Economic dynamics within a marriage add another layer. A study published in the American Sociological Review examined how a couple’s relative earnings related to infidelity and found a pattern that ran in opposite directions for husbands and wives. For men, being the primary breadwinner was associated with more infidelity. For women, being the breadwinner was associated with less. The researcher argued that breadwinning women may stay faithful as a way to offset the social tension of out-earning their husbands, essentially neutralizing their “gender deviance” by being unimpeachable in fidelity.4American Sociological Review. Her Support, His Support: Money, Masculinity, and Marital Infidelity
The same study uncovered a second dynamic that applied to both sexes: economic dependency on a spouse was linked to higher odds of cheating. But the effect was stronger for men. A man who relies financially on his wife was more likely to cheat than a woman in the equivalent position. The interpretation is that financial dependency threatens masculine identity in particular, and infidelity becomes a way to reassert independence or restore a sense of equity in the relationship.5American Sociological Review. Her Support, His Support: Money, Masculinity, and Marital Infidelity None of this is about biology. It is about how deeply gendered expectations around money and provision shape intimate behavior.
Sexual Infidelity Versus Emotional Infidelity
The question of “who cheats more” becomes murkier when you consider that men and women tend to cheat differently, or at least to be perceived as cheating differently. Research on perceptions of infidelity found that men were seen as committing sexual infidelity more often, while women were perceived as committing emotional infidelity more often.6Academia. Perception of Emotional and Sexual Infidelity among Married Men and Women Whether these perceptions map cleanly onto reality is debatable, but they do shape how people define cheating in the first place. If you define infidelity only as sex with someone outside your relationship, men come out ahead. If you include deep emotional bonds with a third party, confiding in someone else instead of your partner, or sustained romantic attention directed outside the marriage, the picture shifts.
The distinction also matters because men and women react differently to each type. A foundational study on sex differences in jealousy found that men were more distressed by a partner’s sexual infidelity, while women were more distressed by emotional infidelity.7Psychological Science. Sex Differences in Jealousy: Evolution, Physiology, and Psychology More recent work has complicated this by showing the gender difference in jealousy largely disappears among people who are in committed relationships. Among those in serious partnerships, men and women chose sexual infidelity as the more upsetting form at nearly identical rates (about 48 percent of men and 47 percent of women). The gender split only showed up clearly among people who were not in committed relationships, where men were more bothered by sexual infidelity and women by emotional infidelity.8PubMed Central. Relationship status and gender-related differences in response to infidelity Being invested in an actual relationship, it seems, makes the type of betrayal feel similarly devastating regardless of gender.
Why Women Report a Stronger Motivation to Stay Faithful
An interesting counterpoint to the “who cheats more” question is the research on who resists cheating and why. A study that catalogued 47 distinct reasons people gave for not cheating on their partners found that women reported a higher overall propensity not to cheat than men. The biggest drivers for women were relationship satisfaction and anticipated guilt. Women who were happy in their relationships and who expected to feel terrible afterward were substantially less inclined to stray.9Personality and Individual Differences. The reasons that prevent people from cheating on their partners: An evolutionary account of the propensity not to cheat
Guilt itself follows gendered lines once infidelity has occurred. Research on post-infidelity guilt found that men feel guiltier after sexual infidelity specifically, while women feel guiltier after emotional infidelity. Both sexes believed their partners would have a harder time forgiving sexual infidelity, but women, not men, reported that sexual infidelity would be more likely to end the relationship entirely.10Evolutionary Psychology. Sex Differences in Feelings of Guilt Arising from Infidelity This suggests that men and women not only cheat for somewhat different reasons but process the aftermath through different emotional filters.
What Motivates Affairs When They Happen
A multinational study that examined why women specifically pursue affairs tested several evolutionary hypotheses and found support for what researchers call a “dual mating” pattern: women were more physically attracted to their affair partners and more parentally attracted to their primary partners. In plain terms, the affair partner was seen as more physically appealing (scoring nearly two points higher on a physical attraction scale), while the primary partner was seen as a better co-parent (scoring over three points higher on a parental attraction scale).11Evolution and Human Behavior. Why women cheat: testing evolutionary hypotheses for female infidelity in a multinational sample The study did not find support for the idea that women use affairs to “trade up” to a better overall partner; affair partners were not preferred on general mate value.
Perhaps more telling, the quantitative analyses found no significant gender differences in this dual pattern. Men showed the same tendency to compartmentalize physical attraction and parental suitability between affair and primary partners. At the individual level, though, the qualitative data revealed a messier picture, with participants reporting motivations that ranged across several different strategies, including thrill-seeking, revenge, loneliness, and falling unexpectedly for someone new.12ScienceDirect. Why women cheat: testing evolutionary hypotheses for female infidelity in a multinational sample The headline evolutionary narrative, that men cheat for sex and women cheat for emotional connection, is too tidy. Real motives are varied, overlapping, and often not cleanly gendered.
Dating Apps and Digital Infidelity
A question many people have is whether the rise of dating apps has changed the gender dynamics of cheating. A study examining Tinder users and infidelity found that when you accounted for a person’s general openness to casual sex and their stated intentions to cheat, gender was not a significant predictor of using Tinder to meet partners outside a relationship.13Personality and Individual Differences. Swiping right: Sociosexuality, intentions to engage in infidelity, and infidelity experiences on Tinder In other words, it is not that men use dating apps for cheating while women do not. Rather, individuals who are already inclined toward casual sex and already thinking about cheating use the apps for that purpose, regardless of gender. The app is the tool, not the cause.
The concept of “micro-cheating,” which covers behaviors like flirtatious texting, maintaining secret social media contact with an ex, or emotionally intimate online conversations, has attracted growing research interest. A mixed-method study of micro-cheating found no significant difference in its psychological impact across genders. Male, female, and queer respondents all experienced similar effects on relationship satisfaction, perception of alternatives, and feelings of investment in the relationship when their partner engaged in micro-cheating behaviors.14ResearchGate. Exploring the Psychological Impact of Micro-Cheating: A Mixed-Method Analysis of the Betrayed Partner in a Relationship Whatever the form of betrayal, digital or physical, the sting is comparable.
Genetics and the Biology of Fidelity
There is a modest but real genetic component to infidelity. A twin study examining female infidelity found that about 41 percent of the variation in infidelity and 38 percent of the variation in number of sexual partners were attributable to genetic influences. The genetic overlap between the two traits was strong as well, suggesting that whatever genes contribute to having more partners also contribute to having partners outside a relationship.15PubMed Central. Genetic influences on female infidelity and number of sexual partners in humans: a linkage and association study of the role of the vasopressin receptor gene (AVPR1A) The researchers attempted to link this to a specific gene, the vasopressin receptor gene that influences pair bonding in other mammals, but were unsuccessful. So while genes play a role, the specific biological pathways remain unclear.
Heritability estimates like these do not mean infidelity is “in your DNA” in any deterministic sense. A heritability of 41 percent means that in the population studied, about that much of the variation in the behavior could be traced to genetic differences between individuals. The remaining majority is environmental, encompassing relationship quality, opportunity, cultural norms, and personal choices. Still, the finding is a useful counterpoint to purely moralistic framings of infidelity. Biology is not destiny, but it is part of the landscape.
Sexual Orientation and Infidelity
Most infidelity research focuses on heterosexual couples, but a study examining infidelity-related behaviors on social media across sexual orientations found no significant differences between gay and lesbian individuals and heterosexual individuals in how much they engaged in these behaviors online.16PubMed Central. Sexual Orientation and Infidelity-Related Behaviors on Social Media Sites This is a limited finding (social media behavior is not the same as in-person infidelity), but it aligns with the broader theme of this research area: when you strip away the surface-level demographic categories and look at underlying psychological variables like relationship investment, sociosexual openness, and opportunity, the demographic labels themselves do less explanatory work than you might expect.
Same-sex relationships do face distinct pressures that can complicate direct comparisons. Different community norms around monogamy, the smaller dating pool that makes running into exes more common, and the absence of some traditional institutional barriers to leaving a relationship all create a context where “cheating” may be defined or experienced differently. Researchers in this space are still building the evidence base, and much of the existing data leans heavily on convenience samples, so broad generalizations are premature.
When the Definition Itself Is the Problem
One reason the “who cheats more” question resists a clean answer is that people do not agree on what counts as cheating. For some, watching pornography crosses the line. For others, an emotionally intense friendship is worse than a drunken one-night stand. Some couples consider sexting a serious betrayal while others barely register it. Research consistently finds that definitions of infidelity vary not just between individuals but between genders, age groups, and cultural contexts. The survey that finds men cheat more may be measuring a narrower definition of cheating that captures male-typical behavior more readily than female-typical behavior.
This is not a trivial methodological quibble. If women are more likely to have affairs that are emotional in nature, or that involve sustained romantic connection without physical sex, and if those affairs are underrepresented in surveys that ask primarily about sexual intercourse, the data will systematically undercount women’s infidelity. The same applies in reverse: if men’s emotional affairs go unrecognized because they take forms that look like ordinary male friendship to an outside observer, those are missed too. Every number you see about infidelity rates is an artifact of whatever definition the survey happened to use.
What Has Actually Changed in Recent Years
The cultural backdrop of infidelity has shifted in ways that make historical comparisons tricky. Women’s labor-force participation, financial independence, and access to private digital communication have all increased substantially over the past two generations. Each of these changes removes a barrier that once made women’s infidelity more difficult and more costly. At the same time, cultural attitudes toward female sexuality have loosened, potentially reducing the social desirability pressure on women to conceal extramarital behavior in surveys. The narrowing of the gender gap in self-reported infidelity may reflect an actual increase in women’s cheating, a decrease in men’s, more honest reporting by women, or some combination of all three. Disentangling these explanations from one another is essentially impossible with the tools researchers currently have.
What the evidence does support, taken as a whole, is that the popular framing of men as natural cheaters and women as naturally faithful is a cultural story, not a scientific one. When you equalize power, the gender difference disappears. When you account for social desirability, it shrinks. When you broaden the definition of infidelity beyond sex, it gets murky. When you look at who actually resists cheating and why, you find that relationship satisfaction and guilt matter for everyone, just in different proportions. The honest answer to “who cheats more” is that men still self-report higher rates, but the reasons for that gap have more to do with social architecture than with anything hardwired.