Polygamist groups that get the most publicity in the media and on TV shows are heterosexual, religious-based, patriarchal, perceived and represented as cultish, and sometimes involve teen girls who are married to an older man who has more than one wife.
Generally these women are not free to have sexual relationships with others, but consider themselves family with the other wives of their husband.
(For those wishing to delve deeper, Angi Becker Stevens, in her excellent piece in Huff-Post, and Laurie Ellington, Poly/Open Relatiohnship Coach, eloquently address their own polyamorous committment and lifestyles.)Some forward thinking dating sites , such as Ok Cupid, have begun to offer flexible and varied relationship and gender labels, which enable the member to self-identify, i.e "seeing someone,” “married,” or “in an open relationship", as well as choose from the many gender options: On the other hand, don't look to the dating site giant, for inclusive options.
Match.com, who always attempts to appeal to the mainstream majority, is more than clear about their position about members searching for open or poly dating/relationships on their site: Surprisingly, although we have been guilty of maligning Plenty of Fish , its "anything goes" atmosphere lends itself perfectly to members seeking less traditional relationships, and offers a good option for poly folks looking for like-minded partners.
Polygamy is illegal in the United States, although in many countries and religions having more than one spouse is not illegal.