Miscellaneous Terms
polygamy or bigamy = having more than one spouse at a time.
polygyny = the marriage and mating of a single male to several females.
polyandry = the marriage and mating of a single female to several males.
polyamory = intimately (sexually and/or emotionally) loving others outside of ones primary relationship
(which swinging may be classified under)
swinging = multiple sexual partners outside of ones primary relationship.