I agree that we have evolved as higher animal’s and we are above that. A relationship between a Man and a Women is meant to be Monogamous. You can look at it from a religious aspect or just as a socially accepted norm that we have come to expect as a society. OP wrote that some of these women are willing to turn a blind eye and accept that their man cheats. Being a woman who had a man cheat on me more than once, I forgave him and he did it again. I felt betrayed and foolish and it ultimately ended our marriage.