Marriage: a legal, religious, and social binding between people.[1]
Monogamy: having a single long-term romantic and sexual partner
Ménage à trois: having a domestic arrangement with three people sharing romantic or sexual relations; typically a traditional marriage along with another committed individual, usually a woman[2]
Polyamory: encompasses a wide range of relationships; polyamorous relationships may include both committed and casual relationships.
Group marriage: marital arrangement where three or more adults enter into marriage
Sexual fidelity: not having other sexual partners other than one's committed partner, even temporarily
See also
Hookup culture: a culture encouraging numerous and sometimes anonymous sexual partners
Sexual infidelity: having a sexual relationship without a commitment to have no other sexual partners
Serial monogamy: having a series of monogamous relationships, one after the other
Open relationship: having a partner without excluding other romantic or sexual involvement
Open marriage: marital arrangement where partners agree that each may engage in extramarital sexual or romantic relationships
^Haviland, William A.; Prins, Harald E.L.; McBride, Bunny; Walrath, Dana (2011). Cultural Anthropology: The Human Challenge (13th ed.). Cengage Learning. ISBN978-0495811787.
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