There really is no reason for Polygamy unless the Human race is on the brink of extinction. I for one am aganst it. There should only be one wife and one husband, and that also gose for gays and bis. Merrage is suppose to be a union of two people, not three, not four, but just two. As said before, the reason for Poligamy is for mass production of babies. Others I think just like it for the sake of having more then one partner to do the dirty deed with. Or because its just practiced because its part of a culture.
Well from where I am standing, the Human population is not in a decline, infact there are to many of us in the would and our planet is struggling to keep us all alive. Those who practice Polygamy just for the sake of having sex is just digusting and makes my skin crawl just thinking about it, its just wrong because there is no love, no nothing. Its just vile and selfish. Now for the culturle aspect of this and I dont mean to offend any one in any way buy this so please dont hurt me, but the simple fact that Polygamy was practiced because said culture had a small population and most likey a high infant mortality raight. But todays day and age, infant mortality raight had deminished around the world in all but a few countries. So for those who still practice Polygamy simply because its part of a culture, then I think strongly that it should be brought up to date.