Which burns more: knowing your partner had sex with someone else, or knowing their heart has settled elsewhere? In forced-choice tests, men on average are more distressed by sexual infidelity and women by emotional infidelity—a finding repeated since 1992. Yet when people were asked to imagine sexual infidelity vividly and precisely, the sex difference was no longer significant. Both forms are painful; the difference lies in which image the mind magnifies.
What Exactly Is Emotional Infidelity, and Where Is the Boundary with Friendship?
Sexual infidelity has a relatively clear definition: sexual contact with someone outside a relationship the two people consider exclusive. Emotional infidelity has a blurrier boundary: intimacy, secrecy, and emotional investment that were supposed to belong to the primary relationship are shifted to a third person.
Research on internet infidelity shows that even couples find this boundary ambiguous. In a 2020 online survey of people whose partners had online relationships, Vossler and Moller found respondents labeled sexual behaviors—cybersex, exchanging sexual images, and sharing sexual fantasies—as infidelity more often than emotional behaviors. This aligns with offline research, where sexual behavior is the clearest marker. Open-ended responses showed online life is confusing and definitions become broader and more fluid; a limitation is the volunteer online sample, which cannot be generalized to all couples.
Emotional infidelity can begin quietly in the glow of a phone screen, with a partner just inches away — Image: AI-generated
Quotable: In online spaces, definitions of infidelity become broader and more fluid, although sexual behavior remains its clearest marker (Vossler and Moller, 2020).
Why Do Men and Women, on Average, React Differently?
David Buss showed in 1992 with three studies and two methods—forced-choice questionnaires and physiological measurement—that men are more distressed by sexual infidelity and women by emotional infidelity. His 2018 review reports that later meta-analyses have consistently confirmed this difference. The evolutionary explanation: infidelity threat is not identical for the sexes; men historically faced uncertainty about paternity, women did not, and jealousy evolved to protect high-investment relationships.
What matters for any reader is that these are averages, not a verdict about any individual person. [needs further review: Buss’s review does not report the size of overlap between men’s and women’s responses; it reports only the direction of the average.]
Quotable: Sex differences in jealousy are a replicable finding, but they are averages and do not dictate what happens in your own relationship (Buss, 2018).
Does This Difference Come Down to Mental Imagery?
Kato (2014) tested another hypothesis: men may mentally construct sexual infidelity more vividly and precisely, causing greater distress. He studied 64 men and 64 women in committed relationships, using vivid scenarios and photographs to evoke detailed sexual imagery of a partner’s infidelity. Both groups became more distressed when they imagined sexual infidelity vividly and realistically; no significant sex difference appeared.
Limitations include a small sample of 128 people, one culture, and a laboratory setting far from real discovery. The sex difference has not disappeared; part of it may reflect how each mind builds images.
A psychoanalytic view adds another layer. In his 1922 paper on neurotic mechanisms of jealousy (Standard Edition, vol. 18), Freud distinguished normal or competitive, projected, and delusional jealousy. The second layer is illuminating: sometimes what a person sees in a partner is a projection of their own desire or infidelity. This helps explain why the image of infidelity can become more vivid and persistent than reality.
After Discovering Emotional Infidelity, When Is Professional Help Needed?
In clinical experience, couples typically arrive with two questions: “Was this really infidelity?” and “Can our relationship be repaired?” The first answer depends less on the behavior and more on the couple’s unwritten agreements: what one couple treats as ordinary friendship, another experiences as a clear violation of trust.
Professional help is valuable if secrecy continues after discovery; every conversation about the topic turns into a fight or prolonged silence; sleep, concentration, or work is disrupted; or the couple’s sexual relationship has stopped altogether.
For Iranian families spread across Tehran, Toronto, Los Angeles, and Dubai, much of their emotional life takes place on messaging apps, so the boundary between friendly conversation and hidden intimacy can blur more quickly.
Quotable: Repair after emotional infidelity begins with asking what the couple themselves considered exclusive.
Is chatting with a coworker or old friend emotional infidelity?
Not necessarily. Conversation by itself is not infidelity; the warning signs are secrecy, a shift in emotional intimacy, and quietly comparing a partner with that person. Vossler and Moller found that definitions of infidelity online are more fluid, so the best measure is the couple’s own explicitly agreed boundaries.
Which type of infidelity hurts men more?
In forced-choice tests, men on average are more distressed by sexual infidelity, and women by emotional infidelity; meta-analyses confirm the difference. But this is an average. Many men are also deeply hurt by emotional infidelity, and that response is completely understandable.
Can a relationship be repaired after emotional infidelity?
The studies reviewed here do not provide a statistical answer to this question [needs further review]. In clinical experience, repair is more likely when secrecy stops, the injured partner feels heard, and the two people define new boundaries together. Professional guidance can make this path shorter.
Why can’t I get the image of infidelity out of my mind?
Kato’s experiment showed that vivid, detailed imagery increases distress in both sexes. Freud also noted that part of this image may come from inside ourselves. If intrusive images are disrupting sleep or work, talking with a professional can help.
Conclusion: Which Kind of Infidelity Hurts More?
Research says men are on average more distressed by sexual infidelity and women by emotional infidelity, but when the image is made vivid, the gap narrows in a small experiment. The real question is not which is worse, but what the couple considers exclusive and whether they have said so clearly. Clear boundaries can be built, and honest conversation—even after a crisis—is often the starting point for deeper intimacy.
Looking for professional support with your relationship or mental health?
Buss DM. Sexual and Emotional Infidelity: Evolved Gender Differences in Jealousy Prove Robust and Replicable. Perspect Psychol Sci. 2018;13(2):155-160. PMID: 29592639. DOI: 10.1177/1745691617698225
Kato T. A reconsideration of sex differences in response to sexual and emotional infidelity. Arch Sex Behav. 2014;43(7):1281-1288. PMID: 24647817. DOI: 10.1007/s10508-014-0276-4
Vossler A, Moller NP. Internet Affairs: Partners’ Perceptions and Experiences of Internet Infidelity. J Sex Marital Ther. 2020;46(1):67-77. PMID: 31876266. DOI: 10.1080/0092623X.2019.1654577
Freud S. Some neurotic mechanisms in jealousy, paranoia and homosexuality (1922). In: Strachey J, ed. The Standard Edition of the Complete Psychological Works of Sigmund Freud, Vol. 18. London: Hogarth Press.
Image Credits
All three images in this article are AI-generated and come from the site’s own image library. No real person is depicted.
