Seriously, if we say two men can marry why not allow a man and two women to marry? We have a seriously low birthrate in the developed nations and polygamy would help. We might also bump up the quality of the gene pool a bit if women could marry men who were higher up on the food chain rather than having to settle on bottom feeders. And never once did the Bible condemn polygamy. In fact only the Koran limits the number of wives a man can have to four.