Cohabitation of a man and a woman without the full sanctions of legal marriage. In the Judeo-Christian tradition, the term concubine has been generally applied exclusively to women; Western studies of non-Western societies use it to refer to partners who are sanctioned by law but lack the status of full wives. Seealso common-law marriage; harem; polygamy.
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Historically, concubinage was frequently voluntary (by the girl and/or her family's arrangement), as it provided a measure of economic security for the woman involved. Involuntary, or servile, concubinage sometimes involves sexual slavery of one member of the relationship, typically the woman, being a pleasure slave to the man.
Where it has a legal status, as in ancient Rome, and in ancient China, concubinage is akin, although inferior, to marriage. In opposition to those laws, traditional Western laws do not acknowledge the legal status of concubines, but rather only admit monogamous marriages. Any other relationship does not enjoy legal protection; the woman is essentially a mistress.
"King Solomon loved, in addition to the daughter of Pharaoh, many foreign women, Moabite, Ammonite, Edomite, Sidonian and Hittite women, from the nations concerning which the Lord had warned the Israelites. "You must not cohabit with them, nor they with you, for they will certainly turn your hearts to their gods". Solomon held fast to them in love. He had 700 official wives and 300 concubines...." (1 Kings 11:1-3).