Joy Davidson, Ph.D., is a psychologist, certified sex therapist, author and video-maker based in Manhattan. She is a familiar expert guest on national television and radio, including “Oprah,” “20/20,” CNN News, NPR, “Prime Time Live,” “Entertainment Tonight” and “Montel.” Dr. Davidson is the author of or contributor to six nonfiction books, and the creator of multi-volume self-help videos for women and couples. She is well known as a magazine and Web advice columnist and appears frequently in publications such as Glamour, Cosmopolitan, Marie Claire, Esquire, Redbook and Men’s Health.