In fairness, this isn’t exclusive to poly relationships. You see it in the occasional weirdness of proudly “trad” monogamous people who say that their spouses shouldn’t have friends of the opposite sex. I would guess that most people who leave their partners for another person aren’t doing it with someone who they met in their polycule, but because it’s his secretary, her personal trainer, etc. It all suggests a deep, longstanding issue. And you’ll hear the cheating spouse claim they were pushed into the arms of the other person. And you have spouses who stick together despite both having affairs at the same time. It’s messy because humans are involved.
And I think it’s fair to say that monogamy works for many people, but it also doesn’t work for many. Cheating, which will never be eliminated, seems proof of this. A lot of the older generation who we mythologize as having these stable, happy 50-year relationships, are either not all that happy or were not staying monogamous their whole lives. Flings, affairs, one-offs were all very common, and they always will be. The Total Monogamy culture (before ‘free love’ and all that) was one of silence, discretion bordering on (or being) deception, and the assumption that “everyone is doing it.” To the extent that the “poly people” want to replace that silence and assumption with open and honest communication, it would be a welcome change. But as I said earlier in the thread, the men holding themselves out as “poly” usually do not have very noble intentions. They’re usually exceptionally poorly equipped to actually care for and nurture their partners.
That’s all. This thread still does an important service of shitting on the redditors who make sex uncool.