Polygamy is a marriage or relationship which includes more than two partners. When a man is married to more than one wife at a time, the relationship is called polygyny; and when a woman is married to more than one husband at a time, it is called polyandry. If a marriage includes multiple husbands and wives, it can be called group or conjoint marriage. All parties involved in these type of relationships are polygamous
Peter, Paul and Mary are in a healthy and loving polygamous relationship with each other.