Half of all Americans say they have been cheated on, according to a YouGov poll of 1,125 U.S. adults conducted in April 2025. One in three admit they were the one who stepped outside the relationship, and one in four say they had sexual contact with someone other than their partner without that partner’s knowledge. Another 11% say it happened with their partner’s full awareness and consent, a small but real slice of couples who have openly renegotiated what monogamy means to them. The instinct is to treat infidelity as a rare betrayal that only happens to other people. Statistically, it is closer to a coin flip.
The Gap Between Who Cheats and Who Gets Caught
Men and women report the experience differently, and the gap shows up on both sides of it. In the YouGov data, 29% of men say they had sexual contact with someone else without their partner’s consent, compared with 21% of women. A separate breakdown of partner infidelity cited by the Survey Center on American Life found 58% of women and 50% of men reporting that a partner had cheated on them at some point. The person doing the cheating and the person discovering it, in other words, rarely land on the same number. Roughly one-fifth of Americans who admit to cheating describe it as exclusively emotional rather than physical, which complicates the tidy line many couples draw between “cheating” and “just talking to someone.”
Almost Nobody Says They Would Be Fine With It
Tolerance for a partner’s infidelity is low across the board, but it isn’t distributed evenly. Only 4% of Americans overall say they would be completely okay if their partner cheated, and 74% say they would not accept it under any circumstances. Men are notably more forgiving in theory, with 32% saying they would be somewhat or very accepting of a partner’s infidelity, compared with just 19% of women. Women are also more likely to reject it outright: 81% say they would not be okay with a partner’s infidelity, against 68% of men. Even though the underlying behavior splits fairly evenly by gender, the emotional cost of discovering it clearly does not.
Generations Don’t Even Agree on What Counts as Cheating
Part of why the numbers feel so slippery is that Americans can’t agree on where the line sits in the first place. A national survey highlighted by the Institute for Family Studies found that 45% of respondents consider following an ex on social media “sometimes cheating,” while 16% call it cheating no matter what. Gender shapes those definitions as much as age does: 59% of women label flirtatious messaging with someone else as “always cheating,” compared with 42% of men, and 70% of women say maintaining an active dating profile while partnered counts as infidelity, versus 55% of men. Generational splits show up in odder places too, like the 25% of millennials who consider a strip club visit “always cheating,” compared with 18% of Gen Xers. None of that changes what the YouGov numbers show about actual behavior, but it explains why two people can live through the same betrayal and argue for years about whether it even qualifies.
The Epidemic That Isn’t Actually Getting Worse
Despite headlines suggesting infidelity is spiraling out of control, the long-running General Social Survey shows that rates of extramarital sex have stayed relatively flat for decades, a trend the Survey Center on American Life highlighted in its own analysis of the numbers. Perception tells a different story. Fifty-seven percent of young women and 44% of young men believe infidelity among committed couples is “extremely” or “very” common, far outpacing what the actual data shows. Smartphones may be feeding that gap more than real behavior is: more than one in ten married adults under 40 now use dating apps even while partnered, and 42% of young women say they have checked a partner’s phone without permission at some point. Suspicion, it turns out, is easier to come by than the thing itself.
What the Numbers Actually Mean for You
None of this makes infidelity hurt any less for the people living through it, and a coin-flip statistic offers no comfort to someone who just found a message they weren’t supposed to see. But it does reframe a common assumption most people carry into their relationships. Cheating isn’t a freak event reserved for unlucky couples; it’s a widespread, well-documented part of American relationship history that most adults will either experience firsthand or narrowly sidestep. That doesn’t excuse it, and it doesn’t make it hurt less when it happens. It does explain why so many long-term partnerships survive it anyway, and why so few people ever feel prepared for how ordinary it turns out to be.
