Complex marriage is a form of community marriage where the individuals are all married to one another.
More About Complex Marriage
A complex marriage is a marriage between multiple men and women where the relationship is open. All women are wives to all involved men, and all men are husbands to the wives of the women. The sexual relationships between the men and women involved are open, but pregnancy and childbirth are a community decision; so, most complex marriages have rules regarding contraceptive use.