When you put the data together, about 15-20% of married couples cheat. The rate of cheating increases with age for both married men and married women. In a study titled Americas Generation Gap in Extramarital Affairs, 20% of older couples noted that they had cheated during their marriage.

How common is cheating in a relationship?

How Common is Cheating? Cheating is not very common at all; fewer than 25% of men admit to having cheated on their spouse, while at least 15% of women admit to having cheated on their spouse.