Two bold young neuroscientists have initiated a revolution in the scientific study of sexual attraction. Before Ogi Ogas and Sai Gaddam, the only researcher to systematically investigate sexual desires was Alfred Kinsey, who surveyed 18,000 middle-class Caucasians in the 1950s. But Ogas and Gaddam have studied the secret sexual behavior of more than a hundred million men and women around the world. Their method? They observed what people do within the anonymity of the Internet.