Intimacy
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Passion --------------- Decision/Commitment

The Sternberg Triangle (above) was created by Yale professor Robert Sternberg in his 1988 book with Michael Barnes called The Psychology of Love. The triangle holds that three things interact to promote or negate love: intimacy, passion, and decision/commitment.

Sources:
Sternberg, Robert J. and Barnes, Michael L. (Eds.). The Psychology of Love. Yale University Press: New Haven, CT 1988.

Shriver, Sharon P et al. (Eds). Dimensions of Human Sexuality (6th Edition). McGraw Hill: New York 2000.

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