Committed relationship

A committed relationship is an interpersonal relationship based upon agreed-upon commitment to one another involving love, trust, honesty, openness, or some other behavior. Forms of committed relationships include close friendship, long-term relationships, engagement, marriage, and civil unions.

Non-romantic and/or non-sexual committed relationships

 * Family: a group of people related by consanguinity or affinity
 * Friendship: certain kinds of friendships are committed, such as best friends forever, bromance, blood brother, and womance

Committed romantic and/or sexual relationships

 * Marriage: a legal, religious, and social binding between people.
 * 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
 * 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