Polygyny

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Concubinage is an interpersonal and sexual relationship between two people in which the couple does not want to, or cannot, enter into a full marriage. Concubinage and marriage are often regarded as similar, but mutually exclusive.

Ethnic group of people in Namibia

female who is in a sexual relationship, where the other or both parties to the relationship are also in another committed relationship (usually marriage)

History of polygamy among Mormon sects

Medieval Latin legal expression which may be translated as "in the Danish manner"

mating system in which one male lives and mates with multiple females but each female only mates with a single male