Do you support the legalisation of polyagmy and polyandry

[Jinkies]

Such relationships are rather base and primitive. There is a reason why marriage has changed it's context from being polygamous to monogamous.
Only the most primitive societies on earth still have polygamy as an institution. But sure, if you want to go back the same road of regression while claiming this a human rights issue, go ahead, friends.

I get that you consider it base and primitive, but what are your arguments against it (assuming you have any besides your religion saying so)? What, exactly, are the problems with multi-partner marriages? I'm honestly interested if you are aware of any actual flaws with the institution, since it's an area where I'm almost entirely ignorant.