types of relationships in math

An open relationship, also known as non-exclusive relationship, is an intimate relationship that is sexually non-monogamous. The term may refer to polyamory, but generally indicates a relationship where there is a primary emotional and intimate relationship between two partners, who agree to at least the possibility of intimacy with other people.
Open relationships include any type of romantic relationship (dating, marriage, etc.) that is open. The concept of an open relationship has been recognized since the 1970s.

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