Polygamy has nothing to do with oppression, women-as-property or abuse, or at least no more than marriage or many other current institutions.
The fundamental difference is one of exclusivity, which does not, if granted to both sexes, imply any sexism.
Exclusivity is a strange and curious invention in relationships that served some purpose in eras when we needed to control population in order to keep living standards high ('Malthusian economies'), when paternity was otherwise hard to determine, and hence inheritance, and when communities were small and travel rare and hence there wasn't much of a relationship market.
If having sex is regarded as spiritually corrupting, and marriage is about financial benefit then desires for more don't matter, because desire doesn't really come into it anyway.
The fundamental difference is one of exclusivity, which does not, if granted to both sexes, imply any sexism.
Exclusivity is a strange and curious invention in relationships that served some purpose in eras when we needed to control population in order to keep living standards high ('Malthusian economies'), when paternity was otherwise hard to determine, and hence inheritance, and when communities were small and travel rare and hence there wasn't much of a relationship market.
If having sex is regarded as spiritually corrupting, and marriage is about financial benefit then desires for more don't matter, because desire doesn't really come into it anyway.