Approximately one in five married people report being unfaithful at least once. Infidelity is linked to about 17% of U.S. divorces, and its discovery often follows a digital trail, with 68% of betrayed partners learning about an affair through phone or social app evidence.
Key Takeaways
- 20% of married people reported being unfaithful—defined as engaging in sexual behavior outside marriage—at least once
- 6.8% of U.S. adults reported having had a sexual encounter with someone other than their spouse/partner in the past year (GSS-based estimate in an analysis of infidelity)
- 21.4% of adults aged 18–49 reported having cheated on a romantic partner (self-report; relationship infidelity survey estimate)
- 12% of respondents reported having used dating websites/apps to look for affairs (survey measure of behaviors related to cheating)
- 6% of U.S. adults said they had ever paid for online dating services (context for access to tools used in extra-dyadic relationships)
- 58% of people in a national survey reported they would consider a relationship open to reduce conflict (proxy for norms around exclusivity relevant to infidelity risk)
- 2022–2023 U.S. survey data showed that married adults experiencing infidelity report higher rates of psychological distress than those without infidelity involvement (group difference reported in the survey analysis)
- Infidelity is associated with higher rates of depression symptoms in clinical and community samples; a systematic review reports pooled effect estimates
- A systematic review reports that spousal infidelity is linked with increased risk of anxiety symptoms (pooled evidence summarized by the authors)
- A 2017 analysis estimated that divorce-related workplace productivity losses amount to billions annually (quantified in the economic study)
- In a systematic review, relationship breakdown and infidelity are associated with increased financial stress and reduced household economic resources (effect sizes summarized)
- Custody and child-support arrangements following divorce can significantly change household cash flow; child support enforcement data quantify monthly amounts (contextualized in family law datasets)
- In a sample study, 44% of people reported that infidelity led to immediate relationship dissolution (measured share)
- Among betrayed partners in a relationship study, 60% reported they discovered infidelity through indirect evidence rather than direct confession (discovery channel distribution)
- A meta-analysis of disclosure in sexual behavior research found that self-disclosure is less common than concealment for sensitive behaviors; pooled estimates reported
About 20% of married people report sex outside marriage, and infidelity often leaves lasting emotional and relationship damage.
Related reading
01 · Category
Prevalence Rates6 stats
01
20% of married people reported being unfaithful—defined as engaging in sexual behavior outside marriage—at least once
02
6.8% of U.S. adults reported having had a sexual encounter with someone other than their spouse/partner in the past year (GSS-based estimate in an analysis of infidelity)
03
21.4% of adults aged 18–49 reported having cheated on a romantic partner (self-report; relationship infidelity survey estimate)
04
50% of divorce cases in one U.S. sample reported that infidelity played a role
05
Approximately 17% of divorces in the U.S. are attributed to infidelity in analyses that use survey data to infer reasons for divorce
06
In a meta-analysis, the odds of relationship instability were significantly higher among couples where one partner reported infidelity
Interpretation
Prevalence Rates Interpretation
In the prevalence rates on cheating in marriage, reports vary widely from about 6.8% having a sexual encounter outside a partner in the past year to 21.4% admitting cheating at least once, showing that infidelity is far from rare even when measurements differ.
02 · Category
Behavioral Drivers11 stats
01
12% of respondents reported having used dating websites/apps to look for affairs (survey measure of behaviors related to cheating)
02
6% of U.S. adults said they had ever paid for online dating services (context for access to tools used in extra-dyadic relationships)
03
58% of people in a national survey reported they would consider a relationship open to reduce conflict (proxy for norms around exclusivity relevant to infidelity risk)
04
42% of adults who reported being in a relationship said they had seen a partner's messages without permission (privacy boundary breaches linked to suspicion/infidelity dynamics)
05
15% of adults reported they had monitored their partner’s online activity at least sometimes (surveillance behavior associated with trust breakdown)
06
A meta-analysis found that lower relationship satisfaction is a significant correlate of infidelity involvement (effect quantified across studies)
07
The effect size for the association between perceived partner responsiveness and infidelity was significant in a meta-analytic synthesis (reported as r across studies)
08
In longitudinal relationship research, declines in commitment predicted later self-reported sexual infidelity (predictive effect reported in the study)
09
In one study of romantic partners, emotion-focused coping accounted for 18% of variance in infidelity likelihood (behavioral mechanism quantification)
10
A study of risk factors reported that alcohol misuse was associated with higher likelihood of infidelity, with an odds ratio reported by the authors
11
A meta-analysis found that attachment anxiety significantly predicted higher propensity for infidelity (reported standardized effect size)
Interpretation
Behavioral Drivers Interpretation
Across behavioral drivers tied to cheating, the data show that online and boundary-breaching behaviors are common, with 12% using dating apps to look for affairs and 42% having seen a partner’s messages without permission, while even 15% report monitoring a partner’s online activity at least sometimes.
03 · Category
Health & Wellbeing11 stats
01
2022–2023 U.S. survey data showed that married adults experiencing infidelity report higher rates of psychological distress than those without infidelity involvement (group difference reported in the survey analysis)
02
Infidelity is associated with higher rates of depression symptoms in clinical and community samples; a systematic review reports pooled effect estimates
03
A systematic review reports that spousal infidelity is linked with increased risk of anxiety symptoms (pooled evidence summarized by the authors)
04
In studies summarized in a systematic review, infidelity-related stress is associated with decreased relationship satisfaction and increased emotional distress (quantified effects reported)
05
People who discover partner infidelity have higher odds of experiencing post-traumatic stress symptoms in the months after disclosure (odds ratio reported in the study)
06
A longitudinal study found that infidelity discovery predicted increased hostility and decreased marital adjustment over time (effect sizes reported)
07
A study using U.S. survey data estimated that marital dissolution from infidelity is associated with measurable declines in well-being scores (differences reported)
08
A study of stress physiology reported elevated cortisol response in participants exposed to relationship betrayal cues (biomarker quantified)
09
A randomized trial in relationship interventions reports that therapy can reduce relationship distress scores among couples facing betrayal; effect measured by standardized scale change
10
In a large sample study, infidelity-related distress predicted decreased self-rated health by a statistically significant amount (health scale difference reported)
11
A national cohort analysis reported higher mortality risk associated with marital discord; infidelity contributes to discord (mortality hazard ratios reported for marital status changes)
Interpretation
Health & Wellbeing Interpretation
Across these Health and Wellbeing focused studies, infidelity is consistently tied to worse mental health outcomes, including higher psychological distress in 2022–2023 U.S. survey data, elevated depression and anxiety symptoms in pooled systematic reviews, and increased post-traumatic stress symptoms and later hostility and poorer marital adjustment after discovery.
More related reading
04 · Category
Economic Impact6 stats
01
A 2017 analysis estimated that divorce-related workplace productivity losses amount to billions annually (quantified in the economic study)
02
In a systematic review, relationship breakdown and infidelity are associated with increased financial stress and reduced household economic resources (effect sizes summarized)
03
Custody and child-support arrangements following divorce can significantly change household cash flow; child support enforcement data quantify monthly amounts (contextualized in family law datasets)
04
Therapy market spending is large: global psychotherapy services market revenue exceeds $30 billion annually (context for relationship counseling demand)
05
U.S. spending on home equity and assets is affected by marital dissolution; studies report significant declines in household wealth for recently divorced individuals (wealth panel results)
06
$10,000+ average cost for forensic/technological evidence collection in some infidelity cases (industry report estimates for investigation expenses)
Interpretation
Economic Impact Interpretation
The economic impact of cheating and marriage breakdown is substantial, with divorce-related workplace productivity losses running into billions each year and some infidelity investigations costing $10,000 or more, alongside widespread household financial strain reflected in systematic review findings and post-divorce shifts in cash flow.
05 · Category
Reporting & Disclosure7 stats
01
In a sample study, 44% of people reported that infidelity led to immediate relationship dissolution (measured share)
02
Among betrayed partners in a relationship study, 60% reported they discovered infidelity through indirect evidence rather than direct confession (discovery channel distribution)
03
A meta-analysis of disclosure in sexual behavior research found that self-disclosure is less common than concealment for sensitive behaviors; pooled estimates reported
04
In a study of reasons for nondisclosure, 35% of cheaters cited fear of partner reaction as the main reason (reason distribution)
05
Among betrayed partners, 52% reported needing time before discussing the betrayal (reported delay share in qualitative-quantitative study)
06
In a study of digital infidelity, 68% of respondents reported that they learned about the affair through phone/social app evidence (evidence channel share)
07
A survey of relationship counseling clients reported that 75% sought help after disclosure or discovery of betrayal (timing share)
Interpretation
Reporting & Disclosure Interpretation
Across reporting and disclosure contexts, betrayed partners and cheaters most often rely on indirect evidence or delayed, partial communication, such as 60% discovering infidelity through indirect signs and 52% needing time before discussing it, while only 35% of cheaters point to fear of their partner’s reaction as the main reason for nondisclosure.
report visual · Key figures
Infidelity and its impact: how often it happens and how it shows up
Across surveys and samples, reported infidelity is common, and it is frequently associated with relationship dissolution, indirect discovery, and downstream effects.
20%
20% of married people reported being unfaithful—defined as engaging in sexual behavior outside marriage—at least once
6.8%
6.8% of U.S. adults reported having had a sexual encounter with someone other than their spouse/partner in the past year
50%
50% of divorce cases in one U.S. sample reported that infidelity played a role
60%
Among betrayed partners in a relationship study, 60% reported they discovered infidelity through indirect evidence rathe
68%
In a study of digital infidelity, 68% of respondents reported that they learned about the affair through phone/social ap
75%
A survey of relationship counseling clients reported that 75% sought help after disclosure or discovery of betrayal (tim
source-verifiedpsychologicalscience.org · ncbi.nlm.nih.gov · psycnet.apa.org · tandfonline.com
Reference
Cite This Report
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APA
Kevin O'Brien. (2026, February 13). Cheating In Marriage Statistics. Gitnux. https://gitnux.org/cheating-in-marriage-statistics
MLA
Kevin O'Brien. "Cheating In Marriage Statistics." Gitnux, 13 Feb 2026, https://gitnux.org/cheating-in-marriage-statistics.
Chicago
Kevin O'Brien. 2026. "Cheating In Marriage Statistics." Gitnux. https://gitnux.org/cheating-in-marriage-statistics.
Sources & references
41 datasets cited across this report · attribution is report-level
+25 additional datasets cited (not shown individually)