Strutz Strutz:
I don't understand these types of relationships at all. To me you are either single and date and are intimate with different people or you are in a committed relationship with one person. I honestly can't imagine sharing the man in my life (that I'm married to or living with) with another woman (or women) and being ok with that. Maybe I'm just old-fashioned that way.
It's a concept that's not new. To me, it's a good way to ensure that children are raised to adulthood. If each kid has a couple of Dads, and a couple of Moms, then the family could suffer the loss of one bread winner easier. There would still be several left, and no one becomes a single parent.
You wouldn't share your husband with just another woman, you might also share that other woman's husband as well. And his other male lover. There are no rules!
I'm kind of old fashioned too, but I've evolved to the point where I understand you don't choose who you fall in love with. So I make no judgments there. If someone wants to live in a relationship with two or more men and two or more women, so long as it's friendly and consensual, I don't care.
But they should have the same rights as other 'couples' as well.