The thing that is damaging about infedility is the breach of trust and the lying. Maybe monogamy works for some people, but I’m guessing, based on the rate of cheating and divorce, that it’s less people than we tend to believe it is. When people embrace open, honest and ethical ways to get their needs met by more than one person, a lot of good things can happen. We’d be a healthier culture if we continued to move in that direction and make it more socially accpetable.