Book excerpt: A fresh and challenging re-evaluation of the interrelationship between sexual and gender behavior and aggression. Drawing on a series of previously unpublished controlled research studies on rapists, pedophiles, incest offenders, voyeurs, transsexuals, and homosexuals (among others), the book offers startling new findings- e.g., crossdressing and feminine gender identity in rapists believed to be ultra-masculine, aggressiveness in pedophiles believed to be shy and passive. This book brings a new perspective to understanding sexual anomalies and to the conceptual foundations on which clinical research and treatment of these behaviors rests.