I’ll bet you a steak dinner that you’re wrong. There’s lots more benefit in a polygamous relationship for a female than their is in lesbianism. Plus, there are many times more heterosexuals than homosexuals.
Polygamy is inherently conducive to power imbalances, sexual subjugation, and other abuses that do not inherently exist in the case of same-sex marriage. It only seems to work on a very small scale when all the wives get on well together and any inheritance is legally limited to one child or split evenly. If you think things are complicated now, imagine what would happen when those relationships go bad.
And; once a month would suit them just fine.
Betty; don’t YOU have the third Thursday evcery month??