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. His classic Anal Pleasure and Health: A Guide for Men, Women, and Couples just came out in a thoroughly updated 4th Edition. It remains the only research-based book on the subject. Dr. Morin is 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 (www.jackmorin.com). He also has a passion for photography (www.jackmorinphotography.com).