Stanley Althof, Ph.D., a psychologist, and Allen Seftel, M.D., a urologist, are the authors of "Evaluation and Treatment of Erectile Dysfunction." In this age of "Viagra overkill," it is refreshing to have a scholarly review and update of the subject. Their chapter reviews definitions, prevalence, medical risk factors, physiology, and cutting-edge gene therapy. Their model of evaluation integrates biological and psychiatric theories, as does their multidisciplinary treatment approach. Their process of care model has six phases, in which diagnostic tests, oral agents, interventional approaches, and individual and couple counseling are outlined.