I think individual instances of polyandry or polygamy aren't a big deal. However, if these were the norm they would be destabilizing.
and yet they're not. in societies in which it's common, it works very well and has done for centuries. I've lived in such a society (not as a wife!!), and had friends who were one of several wives. they absolutely loved the life. each wife was given a house and often a business of her own, to run as she saw fit. most only saw the husband once or twice a week, which kept the relationships fresh and interesting. they were considerably more 'free' than women in monogamous marriages in the same society.
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