Not my place to say if I truly belong to any of those groups, but almost any man could cheat if he really wanted to. For me, probably the main reason I remain faithful is because of my own pride and ego. Plus there's really no upside to cheating, only things like babies, STI's, divorce. Furthermore, I just don't trust people like that. I'm not rich, but I could certainly see how some may see my situation as some kind of opportunity.
Also it helps if you're truly physically attracted to your wife in the same way you may be attracted to someone else. I look at my wife the same way many people here look at the IG "models" and women used as profile pictures.