Interpersonal relationship
Romantic relationships

Romantic relationships have been defined in countless ways, by writers, philosophers, religions, scientists, and in the modern day, relationship counselors. Two popular definitions of love are Sternberg's Triangular Theory of Love and Fisher's theory of love. Sternberg defines love in terms of intimacy, passion, and commitment, which he claims exist in varying levels in different romantic relationships. Fisher defines love as composed of three stages: attraction, romantic love, and attachment. Romantic relationships may exist between two people of any gender, or among a group of people, as in polyamory. On the basis of openness, all romantic relationships are of 2 types: open and closed. Closed relationships are strictly against romantic or sexual activity of partners with anyone else outside the relationships. In an open relationship, all partners remain committed to each other, but allow themselves and their partner to have relationships with others.

On the basis of number of partners, they are of 2 types: monoamorous and polyamorous. A monoamorous relationship is between only two individuals. A polyamorous relationship is among three or more individuals.
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