Full context:   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.[additional citation(s) needed] 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.