Originally Posted by MusicalRose
I think hormones may have a bit to do with jealousy, but I think it has more to do with how people are socialized into thinking of relationships as exclusive and in terms of sexual possessiveness. Women get jealous and fight about it in the U.S. now, but in other countries or in the past, where one man was expected to have many wives, there were situations where all the wives were cooperative with each other and functioned quite well.
I think it may have something to do with it, but I feel MusicalRose hit it right on the head. Our society has made this lifestyle taboo, but if you look elsewhere, it can be a fairly common practice. Now to go along with what you're saying Jokutus, you typically see a man with many wives, but not a woman with many husbands. There are SOME cultures out there, but few and far between. Interesting question.