Jack Morin, Ph.D., has been studying the erotic adventure as a clinician and researcher for more than three decades, often delving into uncharted territory. He is the author of The Erotic Mind, an in-depth guide to what turns us on-and why. He's a professor at the California Institute of Integral Studies and a faculty member at the Institute for the Advanced Study of Human Sexuality. He practices psychotherapy and sex therapy in the San Francisco Bay Area.