Personally I think most men do not "cheat" mainly because they do not have the option to do so or have too much to lose. There are however, men that would not "cheat" out of the principle. I used to be one of them, but then I saw too much lol. I still would not "cheat" now, I would rather end the relationship before it ever got to such a point. If I was married on the otherhand with too much to lose and in a deadbedroom, I think would "cheat".
To be honest though, a small part of me does not consider having sex with another woman as "cheating" if there are no emotions involved as crazy as it sounds. I'm not condoning it. I mean, if having NSA sex with another woman is "cheating", then can one argue that having a wank over another woman is cheating aswell? After all it is a form of sexual behaviour which does not involve the partner, but it's mental and not physical. Right?