Raymond C. Rosen, PhD, is Professor of Psychiatry and Medicine and Co-Director of the Center for Sexual and Marital Health at the University of Medicine and Dentistry of New Jersey Robert Wood Johnson Medical School. A prominent scholar and researcher in the area of sexual psychophysiology and male sexuality, Dr. Rosen is a highly productive author and coeditor of many books, including, most recently, Patterns of Sexual Arousal, Erectile Disorders ,Sexual Desire Disorders, and the second edition of Principles and Practice of Sex Therapy. Additionally, he is the editor of Annual Review of Sex Research.