What would happen if ten men married ten women? All the men, all the women. They could do ten day rotations as to who they spend the night with. What good would happen? What bad? What interesting?
What if they coparented, such that nobody knew or asked whose kids were whose?
I’m going some interesting places, and this popped in my head. I’ve never seen it proposed, although I have of course heard of both polygamy and the lesser known polyandry. Edward de Bono also proposed five year renewable marriage contracts