It's occurred to me that if my wife ever cheated on me, maybe instead of getting upset I could just make friends with her boyfriend. We'd already have it in common that we like having sex with my wife so maybe we'd have other stuff in common, too.
A man who is unable to set very fundamental boundaries in a relationship is not a real man. If you enter a relationship with the intention of having a monogamous marriage, then get cucked, then accept it, it means you have no spine. Any "boundaries" that you loosely claim to have, really don't exist. How are you supposed to be a father? Children need a man as a father, not a spineless cuck.
I can respect a man more who just has casual sex/one-night-stands. Because there is a possibility that he can set boundaries once he actually enters a relationship, whereas with you, it's a certainty that you cannot.
Oh I mean IRL I would probably react harshly to my wife breaking that boundary, but the worst case scenario is that she does it with someone who's got terrible vibes and just cannot hang.