I believe that polygamy should be allowed but only with the consent of every person involved. Not the kind where a person has several different wives/husdands that know nothing about each other. Anthropolgically speaking polygamy has its uses and advantages. Both polygny and polyandry seem logically viable.
I think that polyandry, a women marrying numerous husbands would be the way to go. I am under the thinking that humans are not a monogomous people.