Det skulle inte finnas något rättsligt hinder för två par att gifta sig. Det finns omfattande diskussioner om gruppekvivalenter, medmän, samkamrater och intermarried polygynösa grupper i "Månen är en hård älskarinna"
Det står exlicitly att där ...
Faktum är att äktenskap inte ens är rättsligt ratificerade annat än genom det normala avtalssystemet....are no laws--except Warden's regulations--and Warden doesn't care what one Loonie does to another.
I said. "Don't think so, madam. Some bookies do notary work, witnessing chops on contracts, keeping records of them. Is for people who don't read and write and can't keep own records. But never heard of one asked to keep record of marriage. Not saying couldn't happen. But haven't heard." "How delightfully informal! Then this other rumor, about how simple it is to get a divorce on the Moon. I daresay that's true, too?" "No, madam, wouldn't say divorce is simple. Too much to untangle. Mmm... take a simple example, one lady and say she has two husbands--" "Two?" "Might have more, might have just one. Or might be complex marriage. But let's take one lady and two men as typical. She decides to divorce one. Say it's friendly, with other husband agreeing and one she is getting rid of not making fuss. Not that it would do him any good. Okay, she divorces him; he leaves. Still leaves endless things. Men might be business partners, co-husbands often are.