This book offers a collection of original contributions to the current literature on the role of the internet in understanding contemporary issues in sexual offending. The book explores the theoretical underpinnings of the effect of the internet on the development of sexual deviance, before looking at more applied topics including online sexual offending against children and sextortion. Contemporary topics such as image-based sexual abuse, dating app-facilitated violence, and groups referred to as 'incels' are also explored. The book is relevant to psychologists, criminologists, social workers and students, as well as practitioners and the general public.