As Jenny said, only 1 you know of. In a marriage a man is more likely to cheat, because you usually stay together longer and it takes time to break down the relationship. My best friend in college cheated on 6 of his girlfriends during the 3 years I lived with him. He cheated with multiple women on each partner. One ONE found out and only because the girl he cheated with was part of group of friends, the girl confessed to her bf while drunk and the bf told my friend’s girlfriend. That is the only reason she found out. I have another guy friend who cheated on his gf with my gay best friend and with another man, she still has NO IDEA. I had another guy in college I am no longer friends with and he has cheated on the two gf he was with during college. I am sure he has cheated on his gf. Most of my friends in college were guys. By looking and dating these guy you would NEVER guess they would cheat, but because I was close friends with all of them I knew all their dirt. None of those girls ever found out, except the one I told you off. So no, statistics are not lying. I can tell you of about 6 other guy friends who I know have cheated on their gfs, I could go on forever. Knowing what I did I chose to never date any of them.