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Polyamory rule - helpful infographic
(lemmy.blahaj.zone)
Be sure to follow the rule before you head out.
Rule: You must post before you leave.
Human psychology doesn't have a standard.
Monogamy is just one of a wide range of social arrangements that have existed all throughout human history, and continue to exist.
see: distribution of monogamy
Personally, I've been in multiple partner relationships. Are they perfect? No, absolutely not. But neither were some of the monogamous relationships I've been in.
I think the comic is a little off too, and I agree with you about how it portrays cheating, but it doesn't make sense to shit on all forms of relationship that you don't agree with.