Do Opposites Attract?:

>Nevertheless, "that first fine careless rapture," as Robert Browning called romantic love, is generally directed toward someone much like one's self. Most people around the world do feel that amorous chemistry for unfamiliar individuals of the same ethnic, social, religious, educational, and economic background, who have a similar amount of physical attractiveness, a comparable intelligence, and similar attitudes, expectations, values, interests, and social and communication skills.<

Helen Fisher, Why We Love: The Nature and Chemistry of Romantic Love, 2005