In short, polyamory is the act of having intimate relationships with more than one person at the same time. However, polygamy exclusively describes relationships where people are married. Polyandry and polygyny are both forms of polygamy (in other words, they involve marriage too).

Are polyamorous relationships legal?

Having multiple non-marital partners, even if married to one, is legal in most U.S. jurisdictions; at most it constitutes grounds for divorce if the spouse is non-consenting, or feels that the interest in a further partner has destabilized the marriage.

Do polygamists share bedrooms?

In many polygamous relationships, each woman has their own room, and the man just sort of hops from one bedroom to the other, depending on his mood. Intimacy is shared with everyone.