Bigamy is the act of having two spouses at one time. If a person knowingly enters into a bigamous marriage, or she is committing a crime, though it is only prosecuted in special circumstances. The laws and punishments regarding bigamy vary by jurisdiction.
Polyandry is contrasted with polygyny, involving one male and two or more females. If a marriage involves a plural number of "husbands and wives" participants of each gender, then it can be called polyamory, group or conjoint marriage. In its broadest use, polyandry refers to sexual relations with multiple males within or without marriage.