Two people other than spouses who cohabitate are known as having:

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A domestic partnership is a legal or personal relationship between two individuals who live together and share a domestic life but are not married. This term is commonly used to refer to couples of the same-sex who live together, but can also apply to heterosexual couples. A polyamorous relationship involves more than two individuals who have agreed to have romantic and/or sexual relationships with each other. A cohabitation agreement is a legal document that outlines the terms of living together, such as responsibilities and financial obligations, but does not necessarily imply a romantic relationship. Comarital sex is not a commonly used term and may refer to extramarital sex.

Two People Other Than Spouses Who Cohabitate Are Known as Having