open-relationship

An open relationship is an intimate relationship that is sexually non-monogamous. The term is distinct from polyamory, in that it generally indicates a relationship where there is a primary emotional and intimate relationship between two partners, who agree to at least the possibility of sexual or emotional intimacy with other people.
Open relationships include any type of romantic relationship (dating, marriage, etc.) that is open.
An "open" relationship is where one or more parties have permission to be romantically or sexually involved with people outside of the relationship. This is opposed to the traditionally "closed" relationship, where both parties agree on being with one another exclusively. The concept of an open relationship has been recognized since the 1970s.

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