Around 1 in 5 married men report having cheated at least once, based on large social surveys in recent years. Numbers shift a bit by study and definition, but most modern data clusters in the 20–25% range for men in long‑term relationships.

Quick Scoop

Key numbers (recent surveys)

  • About 20% of married men say they have had sex with someone other than their spouse.
  • In some broader relationship samples (not just married), around 23% of men report having cheated on a partner at least once.
  • When both genders are measured together, overall infidelity rates in relationships often land around 20–21% of adults saying they’ve cheated.
  • Many cheaters repeat: in one summary, about two‑thirds of men who cheat on a spouse do so more than once.

So if you imagine a room of 10 married men, current survey data suggests roughly 2 of them have cheated at some point, not half the room, but not a tiny minority either.

Why the number isn’t exact

  • Self‑report bias : People under‑report behaviors they’re ashamed of, so real rates could be a bit higher than survey numbers.
  • Different definitions : Some men don’t even count intercourse as “cheating” in certain polls, which shows how much answers depend on wording.
  • Emotional vs physical : Many stats only track sexual affairs; emotional affairs (e.g., intense online flirtation) are less consistently measured but appear higher, especially for men in some datasets.

A forum discussion recently highlighted this confusion, with some users throwing out guesses as high as 60–70%, while others pointed back to survey numbers near 20% for men and around the teens for women.

Context and trends

  • Across multiple summaries and infidelity round‑ups for 2023–2025, the gap remains: men cheat more than women , but not by a massive margin (roughly 20% vs 13–15% in marriage).
  • Infidelity risk often rises in mid‑to‑later adulthood; for example, some age‑breakdowns show higher percentages among men in their 50s, 60s, and 70s than in their 20s.
  • At the same time, social disapproval of cheating is extremely high (over 90% of people say it’s wrong in at least one recent discussion of U.S. data), so the behavior is common but strongly stigmatized.

Mini takeaway

If you’re looking for a grounded, data‑based answer to “what percentage of men cheat,” a reasonable, honest statement for 2024–2026 data is:

Around 20–25% of men in long‑term relationships say they have cheated at least once, with about 20% of married men specifically reporting infidelity.

This doesn’t mean cheating is inevitable, just that it’s common enough to show up clearly in national and international stats.

Information gathered from public forums or data available on the internet and portrayed here.