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Human Monogamy Has Deep Roots
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Ah, I did a back of the envelope thing to figure it out, you're right, I made some mistakes
Assuming some or all are heterosexual or that not everyone is in a sexual relationship with everyone else, you still need to manage those relationships because even being another partner of an intimate partner you need to keep things at a friendly level because strife between non-intimate relationships becomes pressure between intimate ones. It gets complicated.