Committed relationship — interpersonal relationship based upon a mutually agreed-upon commitment to one another involving exclusivity, honesty, trust or some other agreed-upon behavior. The term is most commonly used with informal relationships, such as "going steady," but may encompass any relationship where an expressed commitment is involved. Close friendship — being close friends Courtship Long-term relationship (LT —R) Monogamy — having a single long-term sexual partner or marriage to one person.