Unfortunately I don't honestly think I know ANYONE who has not cheated on someone or been cheated on while in at least one long term relationship in their lives. Even one of my good friends claims she never cheated on her husband...oh, wait...she made out with me in a drunken state one night when they were engaged but that was okay somehow

.
I've cheated on quite a few of my girlfriends. I have also been cheated on by pretty much the same amount. I have many married friends who really want to cheat because their wives make them miserable or they have kids, but they don't. Yay. Then they are walking around resenting their lives and are such a joy to be around.
Just got a phone call today from a friend who's wife is a total nag and he's just gotten back in touch with his high school sweetheart. He admitted that he's considering going to see her without his wife knowing and has had two hour email conversations with this other woman (who is also married). Is this cheating? Yup.
I just don't understand monogamy anymore. From a health standpoint it makes sense but from a happiness standpoint it is really rare. That's why I'm going to just date for a long long time.