Answer:
Buddhism does not stipulate cultural practices. Buddhism is practiced in many countries, where cultures determine how many wives or husbands a person may have. The Buddhist philosophy stresses not harming people whenever possible, so if you live in a culture in which having more than one wife or more than one husband is acceptable, it's okay to marry more than one person as long as no one is getting hurt by what you're doing. If you live in a place where having multiple spouses is not acceptable, you should abide by those rules, unless your spouses agree, and you all agree to be discreet, so as not to make others uncomfortable with your living situation.