Men cheat more than women overall — 20% of married men and 13% of married women report extramarital sex, according to the General Social Survey (GSS) conducted by NORC at the University of Chicago.
The gender gap narrows sharply among younger adults: women aged 18–29 actually outpace men 11% to 10%, per the Institute for Family Studies (IFS, 2018).
When emotional affairs are included, the American Association for Marriage and Family Therapy (AAMFT) reports rates climb to 45% of men and 35% of women.
Illinois divorce cases involving infidelity carry specific legal considerations under 750 ILCS 5/503 and 750 ILCS 5/504, though adultery alone does not affect property division, maintenance, or parental responsibilities in this no-fault state.
Key Takeaways
- Men report extramarital sex at 20% compared to 13% of women (GSS, NORC at University of Chicago), but women aged 18–29 slightly exceed men at 11% versus 10% (IFS, 2018).
- Infidelity peaks among men in their 70s (26%) and women in their 60s (16%), according to IFS analysis of GSS data — the gender gap reaches 18 percentage points by age 80 and older.
- Illinois became a purely no-fault divorce state on January 1, 2016, meaning adultery does not directly affect property division (750 ILCS 5/503), spousal maintenance (750 ILCS 5/504), or child custody (750 ILCS 5/602.5) — but dissipation-of-assets claims remain available.
- The AAMFT found that 74% of couples who pursued professional therapy after an affair successfully recovered the relationship (AAMFT, 2012 survey).
Infidelity often triggers difficult decisions about divorce, custody, and finances — Cooper Trachtenberg Law Group, LLC has guided Chicagoland families through these decisions since 1988. Schedule a free consultation at (847) 995-8800.
How Do Infidelity Rates Differ Between Men and Women?

Men report higher lifetime rates of extramarital sex than women across every major national survey. The General Social Survey — a federally funded, peer-reviewed study administered by NORC at the University of Chicago since 1972 — found that 20% of ever-married men and 13% of ever-married women acknowledged having sexual intercourse with someone other than their spouse during their marriage.
Infidelity, sometimes called extramarital sex or adultery, is sexual or emotional involvement with a person outside a committed relationship. The GSS measures only physical sexual infidelity through its “EVSTRAY” question.
When the definition expands to include emotional affairs — secret romantic connections without physical intimacy — the numbers rise substantially. The AAMFT reports that approximately 45% of men and 35% of women have engaged in some form of infidelity, including emotional affairs.
A YouGov national poll published in 2024 found that one in three Americans (33%) admitted to cheating on a partner or spouse at some point.
The gap between YouGov’s figure and the GSS figure reflects differences in methodology: the GSS asks specifically about sex during marriage, while YouGov measures broader self-reported cheating across all relationship types.
The gender gap has compressed over time. The IFS noted that the difference shrank from roughly 15 percentage points in the 1990s to approximately 7 points in recent GSS data.
Women’s infidelity rates have increased over the past two decades, particularly among younger cohorts, while men’s rates have remained relatively stable.
| Measure | Men | Women | Source |
| Extramarital sex during marriage | 20% | 13% | GSS, NORC at University of Chicago |
| Including emotional affairs | 45% | 35% | AAMFT |
| Ages 18–29, extramarital sex | 10% | 11% | IFS analysis of GSS, 2018 |
| Self-reported cheating, all relationships | Higher | Lower (gap narrowing) | YouGov, 2024 |
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At What Age Do People Cheat the Most?

Infidelity rates follow distinct age curves for men and women, with men peaking later in life than women. IFS researcher Wendy Wang analyzed GSS data in 2018 and found that men in their 70s reported the highest rate of infidelity at 26%, while men aged 80 and older reported 24%.
Women in their 60s reported a peak rate of 16%, which declined sharply in their 70s and 80s.
Among younger adults aged 18–29, women were slightly more likely than men to report infidelity (11% versus 10%). The pattern reversed among those aged 30–34 and widened progressively through middle age and beyond.
The gender gap reached its maximum of 18 percentage points among adults aged 80 and older.
Trend data revealed generational shifts. Between 2000 and 2009, peak male infidelity moved from ages 50–59 (where it sat in the 1990s at 31%) to ages 60–69 (29%). Peak female infidelity shifted from ages 40–49 (18% in the 1990s) to ages 50–59 (17% in 2000–2009).
Wang attributed these shifts partly to a cohort effect: Americans born in the 1940s and 1950s came of age during the sexual revolution and reported higher lifetime rates of extramarital sex than earlier or later birth cohorts.
| Age Group | Men (%) | Women (%) | Gender Gap | Source |
| 18–29 | 10 | 11 | Women +1 pt | IFS/GSS, 2018 |
| 30–39 | ~14–16 | ~11–13 | Men lead | IFS/GSS, 2018 |
| 40–49 | ~18–20 | ~14–16 | Men lead | IFS/GSS, 2018 |
| 60s | ~24 | 16 | ~8 pts | IFS/GSS, 2018 |
| 70s | 26 | ~6–8 | ~18–20 pts | IFS/GSS, 2018 |
| 80+ | 24 | ~6 | 18 pts | IFS/GSS, 2018 |
Note: Cells marked with ~ are approximated from the IFS chart. Exact figures for 30–49 breakdowns were presented graphically by IFS rather than in tabular form.
All data comes from Wendy Wang, “Who Cheats More? The Demographics of Infidelity in America,” Institute for Family Studies, January 10, 2018, analyzing GSS data.
Why Do Men and Women Cheat for Different Reasons?
Men and women typically cite different primary motivations for infidelity. A 2020 study published in the Journal of Sex & Marital Therapy identified eight primary motivations: anger, low self-esteem, lack of love, low commitment, need for variety, neglect, sexual desire, and situation or opportunity.
Men more frequently reported physical and opportunity-based reasons, while women more frequently reported emotional dissatisfaction and unmet connection needs.
The IFS iFidelity Survey (2020) found that women accounted for 56% of emotional-only affairs, while men comprised 75% of sex-only affairs. A YouGov UK survey found that 58% of female cheaters cited an unhappy marriage as their primary reason, compared to 35% of male cheaters.
Men were five times more likely than women to cite thrill-seeking (21% versus 4%) and three times more likely to cite revenge (10% versus 4%).
Research published by Knopp et al. in the Archives of Sexual Behavior (2017) found that 45% of individuals who cheated in one relationship cheated again in their next relationship, with no significant gender difference.
Certain personality traits — high narcissism, impulsivity, and sensation-seeking — correlate with higher infidelity rates, according to a study published on ResearchGate examining personality’s influence on cheating decisions.
One particularly counterintuitive finding: 56% of men and 34% of women who cheated rated their marriages as “happy” or “very happy,” undermining the assumption that only unhappy couples experience infidelity.
If infidelity is shaping your decisions about property, custody, or support, Cooper Trachtenberg Law Group, LLC represents families across Cook, Lake, DuPage, Kane, and McHenry counties. Request your confidential consultation today.
How Does Digital Technology Change Infidelity Patterns in 2026?
Social media and messaging apps have fundamentally altered how affairs begin and continue. Gitnux reported in 2025 that 38% of affairs now originate through social media rather than in person. A 2024 GlobalWebIndex study estimated that 30% of Tinder users were already in a committed relationship.
The Kinsey Institute (2025 survey) found that 8% of people in committed relationships had used an AI companion such as Replika or Character.AI for romantic or sexual interactions, and 38% of their partners viewed this as a form of cheating.
This emerging category represents an entirely new frontier in defining infidelity that did not exist even five years ago.
Detection methods have also shifted. Among millennial cheaters who were caught (rather than self-disclosing), 40.2% were discovered through phone or text monitoring, 28% through social media posts or interactions, and 16.3% of men were caught through credit card or financial evidence, compared to 8.8% of women.
For couples navigating digital evidence of infidelity in an Illinois divorce, understanding what documentation courts accept matters — though Illinois courts focus on financial impact rather than the infidelity itself.
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How Does Infidelity Affect Divorce Proceedings in Illinois?
Illinois became a purely no-fault divorce state on January 1, 2016, when amendments to the Illinois Marriage and Dissolution of Marriage Act (IMDMA) eliminated all fault-based grounds.
Under 750 ILCS 5/401, the only ground for dissolution is irreconcilable differences, and living separate and apart for six continuous months creates an irrebuttable presumption that this requirement has been met.
Adultery does not directly affect three critical areas of Illinois divorce:
Property division. Under 750 ILCS 5/503(d), courts divide marital property “without regard to marital misconduct.” A cheating spouse does not receive a smaller share solely because of an affair.
However, if a spouse spent marital funds on the affair — hotel rooms, gifts, trips, or financial support for an affair partner — the other spouse can file a dissipation-of-assets claim. Courts can then order reimbursement of the innocent spouse’s share of those wasted funds.
Spousal maintenance. Under 750 ILCS 5/504(a), judges determine maintenance based on financial factors — income, duration of marriage, employability, and standard of living — “without regard to marital misconduct.” Infidelity alone does not increase or decrease a maintenance award.
Parental responsibilities. Under 750 ILCS 5/602.5, courts allocate parenting time and decision-making authority based on 15 statutory best-interest factors. Infidelity is not among them. An exception exists only if the affair directly harmed the children — for example, if a parent exposed children to an affair partner inappropriately or allowed the relationship to interfere with parenting responsibilities.
Adultery remains technically classified as a Class A misdemeanor under 720 ILCS 5/11-35, but no prosecution has been attempted in Illinois since 1997, and the statute is effectively unenforceable.
What Is the Emotional and Family Impact of Infidelity?
Discovery of an affair typically causes significant emotional trauma for the betrayed spouse. Researchers at PMC/National Institutes of Health published a 2023 study examining emotional reactions to infidelity, finding that depressive symptoms, anxiety, and post-traumatic stress responses are common outcomes.
Trust difficulties frequently persist into future relationships regardless of whether the marriage survives.
Children experience distinct effects when infidelity leads to divorce. Academic disruption, loyalty conflicts, increased anxiety, and anger toward the parent who had the affair are well-documented responses.
How parents handle disclosure dramatically affects adjustment — experts recommend age-appropriate honesty without burdening children with adult details or using them as a source of emotional support. Maintaining healthy co-parenting relationships despite personal conflicts protects children’s stability.
Recovery is possible for many couples. The AAMFT’s 2012 survey found that 74% of couples who pursued structured therapy after infidelity successfully recovered the relationship.
Research by Gordon, Baucom, and Snyder (2004) found that 60–75% of couples remained together after discovery, particularly when professional intervention occurred early.
Without professional help, reconciliation rates dropped to roughly 35–45%, according to the same body of research. For individuals navigating the aftermath alone, professional counseling and support resources can help process the complex emotions involved.
What Other Factors Predict Infidelity Beyond Gender and Age?
Race, religion, family background, and relationship type all correlate with infidelity rates independently of gender and age. The IFS analysis of GSS data found that 22% of ever-married Black adults reported infidelity, compared to 16% of white adults and 13% of Hispanic adults.
Among Black men specifically, the rate was 28%, compared to 20% of white men and 16% of Hispanic men.
Religious service attendance emerged as the only factor with consistent statistical significance in predicting both men’s and women’s odds of infidelity, even after controlling for other demographic variables, according to the same IFS regression analysis of General Social Survey responses.
Adults who rarely or never attended religious services cheated at higher rates than regular attendees. Political identity, family background (growing up in an intact two-parent household versus not), and race also showed independent significance in regression models.
Education level showed no significant association with infidelity. Roughly equal shares of college-educated adults (16%) and those with a high school education or less (15%) reported cheating, with adults holding some college education slightly higher at 18%.
Relationship type matters as well. Research from the American Association for Marriage and Family Therapy consistently shows that unmarried cohabiting couples experience higher infidelity rates (35–40%) than married couples (20–25%), suggesting that formal commitment level affects faithfulness.
Relationships in the three-to-five-year range face elevated risk, often coinciding with emotional or physical disconnects that researchers identify as a vulnerability window.
Workplace proximity also plays a documented role: an estimated 31% of all affairs involve a coworker, with 70% of workplace affairs beginning between people who initially considered each other friends (PR Newswire/HighSpeedInternet.com, 2024).
Infidelity can reshape your family’s future — but you do not have to face that transition alone. Cooper Trachtenberg Law Group, LLC, led by Miriam Cooper (practicing since 1988), protects the rights of Chicagoland families in divorce, custody, maintenance, and property division. Book your confidential case review at (847) 995-8800.
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Frequently Asked Questions
Who Cheats More in Marriage, Men or Women?
Men cheat more overall in marriage, with 20% of married men and 13% of married women reporting extramarital sex according to the General Social Survey conducted by NORC at the University of Chicago. Among married adults aged 18–29, women slightly exceed men at 11% versus 10%, per IFS analysis of GSS data published in 2018.
Has the Gender Gap in Infidelity Changed Over Time?
The gender gap in infidelity has narrowed over the past three decades. The Institute for Family Studies documented a compression from roughly 15 percentage points in the 1990s to approximately 7 points in recent GSS data. Women’s rates have increased gradually, particularly among younger cohorts, while men’s rates have remained relatively stable across the same period.
Which Age Group Reports the Highest Rate of Infidelity?
Men in their 70s report the highest male infidelity rate at 26%, and women in their 60s report the highest female rate at 16%, according to IFS analysis of General Social Survey data published in 2018. The gender gap in infidelity widens steadily with age and reaches its maximum of 18 percentage points among adults aged 80 and older.
Does Infidelity Affect Divorce Outcomes in Illinois?
Illinois has operated as a purely no-fault divorce state since January 1, 2016. Adultery does not directly affect property division under 750 ILCS 5/503, spousal maintenance under 750 ILCS 5/504, or parental responsibilities under 750 ILCS 5/602.5. However, dissipation-of-assets claims allow courts to address marital funds spent on an affair.
What Is a Dissipation-of-Assets Claim in an Illinois Divorce?
A dissipation-of-assets claim arises when one spouse spends marital funds for purposes unrelated to the marriage, such as hotel stays, gifts, or trips for an affair partner. Illinois courts can order the dissipating spouse to reimburse the other spouse for the other spouse’s share of those expenditures, effectively adjusting the overall property division to account for wasted marital resources.
Are Emotional Affairs Considered Infidelity?
The American Association for Marriage and Family Therapy defines emotional affairs as a form of infidelity. When emotional affairs are included alongside physical infidelity, reported rates climb to approximately 45% of men and 35% of women. A national survey analyzed by IFS found that 72% of Americans consider a secret online emotional relationship to constitute infidelity.
Do Men and Women Cheat for Different Reasons?
A 2020 study in the Journal of Sex and Marital Therapy identified eight primary motivations for infidelity, including anger, neglect, sexual desire, and opportunity. Women more frequently cite emotional dissatisfaction and feeling neglected, while men more often report physical variety and opportunity as primary drivers, according to YouGov UK survey data.
How Common Is Workplace Infidelity?
Workplace proximity plays a documented role in infidelity, with an estimated 31% of all affairs involving a coworker according to a 2024 PR Newswire and HighSpeedInternet.com study. The same research found that 70% of workplace affairs began between colleagues who initially considered each other friends before the relationship crossed professional boundaries.
Can a Marriage Survive After Infidelity?
Research shows that 60–75% of marriages survive when couples pursue structured professional therapy after infidelity. The AAMFT’s 2012 survey found that 74% of couples who sought therapy after an affair successfully rebuilt their relationship. Without professional help, reconciliation rates drop to approximately 35–45% according to research by Gordon, Baucom, and Snyder.
How Does Infidelity Affect Children During Divorce?
Children whose parents divorce after infidelity commonly experience loyalty conflicts, increased anxiety, academic disruption, and anger toward the parent who had the affair. Illinois courts determine parental responsibilities under 750 ILCS 5/602.5 based on 15 statutory best-interest factors rather than marital misconduct, focusing on each parent’s ability to maintain stability and support.
Does Social Media Increase Infidelity Risk?
Gitnux reported in 2025 that 38% of affairs now originate through social media platforms rather than in-person contact. A 2024 GlobalWebIndex study estimated that 30% of Tinder users were already in a committed relationship. The Kinsey Institute’s 2025 survey found that 8% of people in relationships had used AI companions for romantic interaction.
Is Adultery Still a Crime in Illinois?
Adultery remains technically classified as a Class A misdemeanor under 720 ILCS 5/11-35. However, no prosecution has been attempted in Illinois since 1997, and the statute is effectively unenforceable. Illinois courts focus entirely on no-fault grounds under 750 ILCS 5/401, requiring only proof of irreconcilable differences to dissolve a marriage.


