I can't say why all women would cheat, because I don't know the answer to that. I can say why I would want to cheat. I can say that when I am angry, I don't want to have sex with my husband. Are my reasons for feeling angry valid? I think so, but, my husband says, no. Notice that I have not listed the reasons why I am angry. For purposes of this discussion it doesn't matter. What matters is where we end up. Alone and apart emotionally and physically.