The percentage of men who cheat, according to multiple studies, generally falls between 20% and 27%. One key study found that about 20% of men admitted to having sex with someone outside their marriage, while more detailed questionnaires showed this could be as high as 27%. Overall, infidelity among men tends to be higher than among women, who report cheating rates around 13% to 15%.

The likelihood of men cheating varies with age; men are most likely to cheat between ages 70 and 79, with a reported 26% likelihood. Additionally, workplace affairs are common, with 44% of cheating men having affairs with coworkers.

In summary, around 20% to 27% of men have cheated according to recent statistics, with variations depending on study methods and demographics.