Dexter Morgan

I'm not saying cheating is ever a good thing, but this is patently untrue. Women cheat as well, and they cheat for reasons that are not at all different from the reason men cheat: something is missing from the relationship, often for very complex and not easily-fixed reasons. And it's not just something physical or sexual that's "missing", it actually most often an emotional lack. For instance, if you're a woman whose husband constantly nitpicks and complains, you might get to feel like nothing you ever do is good enough. It may never cross your mind to cheat, ever, until one day you meet a guy who constantly compliments you - rewards your efforts, tells you how talented he thinks you are, etc. You're now getting from him what you're lacking in your husband, and from there, it's easier than you think for an emotional attachment or "love" to result from that. Before you know it, you've got an affair on your hands.

That's only one small example in the very, very long list of reasons people might cheat. Yes, some of them are simply greedy or dishonest, but there's a reason why there are so many cheated-on men and women who sit back and simply can't understand why their partner would cheat, since they're still having sex, and thought it was good or satisfying. It's most often NOT about sex, it just ends up being a part of it, and for some reason, humanity is wired to find that the most repugnant or painful part of an affair - the fact that their partner's genitals touched someone else's.