Nickel said:
I just don't see the point of cheating. If you don't want to be with someone, then don't be with them. Don't run around behind their back (or in front of their face, or whatever). It's just a waste of time.
Nobody really wins. Especially when one (or both) of the people are married and have kids. Someone mentioned it "ok" to cheat if you're in an unhealthy relationship. How healthy is a relationship built on adultery? Just the skewed logic of people trying to justify their behavior.
And no matter how good you are, you're going to get caught. If being ashamed of your own actions isn't enough, imagine the shame children feel when they find out their parents cheat? Mom/dads that have raised them to be loving and respectful to others are now betraying their mom/dad like that? Just a sad, and sick situation.
Then of course there are the legal issues if you're married.
Then you have to worry about your job. If you go for a job that requires a clearance and a poly, one question they can ask is if you have ever committed adultery. They don't care of you've been convicted of it, just if you have done it. Again, a character issue.
It is simply a no-win situation. Because of the love I have for people around me, my own self dignity, and my career, I would never even think of cheating on a woman, especially a spouse.