This book provides authoritative scientific and applied perspectives on the full range of paraphilias and other sexual behavior problems. For each major clinical syndrome, a chapter on psychopathology and theory is followed by a chapter on assessment and treatment. Challenges in working with sex offenders are considered in depth. Thoroughly rewritten to reflect a decade of advances in the field, the second edition features many new chapters and new authors. New topics include an integrated etiological model, sexual deviance across the lifespan, Internet offenders, multiple paraphilias, neurobiological processes, the clinician as expert witness, and public health approaches.