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taking the question as are we monogomous (only tend towards having one lover) by nature, i'd say no
its all just male/female reproductive rolls (coming from an evolutionary standpoint) the general goal in life is to produce successful offspring. naturally, the more we can produce, the better the odds of having someone successfully carry on your genes. so women can only reproduce once ever 10 months or so. males can, well, every few minutes theoretically.
however, if a man slept with a woman, then left and went to someone else and ignored the first woman, the first woman would have no one to protect both her and her child. its in the woman's best interest to keep the man around to protect her. however, the man wants to ensure that the child grows up and carries on his gene, so its also to some extent in his best interest to stay with the first woman. granted if he just fucked another woman every 5 minutes, probably someone would grow up and spread his genes, but he'd probably never see it.
so to ensure you have successful offspring, its generally in both the male and female best interest to stay together and practice monogamy, but there are also advantages (that also happen to go better with carnal instincs) that go against monogomy
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