What term refers to sexual relations with someone considered to be a close relative?

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Incest is the term used to refer to sexual relations with someone who is considered to be a close relative, such as a parent, sibling, or child. It is often culturally considered taboo and is legally prohibited in most societies. Levirate refers to the practice of a man marrying the widow of his deceased brother, while sororate refers to the practice of a man marrying the sister of his deceased wife. Polyandry refers to a marriage in which a woman has multiple husbands, and exogamy refers to the practice of seeking a mate outside of one's own social group or community.

What Term Refers to Sexual Relations with Someone Considered to Be