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There is as reason people have less sex as a relationship goes on...
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I don't think this is true for that reason. 'Literal amount of time spent with partner' is something that varies between relationships such that 'significant time spent with two people' isn't that big a barrier. Which means it's a much smaller effect than 'jealousy' ... or the very significant desire for your partner to be exclusive with you, evolved because you want them invested in your children. But yeah, multiple serious partners is something very few can manage well.
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Anything from 'desire to eat food' to 'anger that friend betrayed you + wanting to get back at them' have really obvious evolutionary reasons. Of course, very important details of how they 'work' aren't obvious from evolution, and it's easy to say untrue things with evopsych speculation like 'we evolved to be TRIBAL animals so we have a dunbar number of twenty and cant have more friends than that", but it's a very useful broad approach.
The mechanisms involved are very tuned towards the causes though? And become meaningless outside those contexts. What purpose does jealousy have if you're not going to have children? Why not just ... not (as poly people do)? Of course, what purpose does sex have outside having children?
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