So a man sees a hot woman. He won't necessarily try to make a move on her. But add the fact that he is feeling unappreciated at home by the missus, not getting enough attention and ego stroking from her, and that this hot chick just gave him a great compliment...and you can see how things happen.

One thing I DO think is generally true of men and women: men are kind of emotionally and mentally in and out of a relationship -- riding the waves. Women are more IN it all the time...but once they DO check out, there is little chance of turning back, I think. It takes awhile for them to reach that point, but if they cross that line, it's basically over and done with for them.

A related question: if an infidelity occurs (let's say a married man goes home with some single chick he meets at a bar), are BOTH people equally to blame, or do you blame the one who is married more than the unattached person (because he made a commitment to someone else/took vows)? Assume the chick knows he is married.