Book excerpt: Research shows that intimate partner sexual violence (IPSV) is the most common form of sexual assault. Professional focus is often on the victim, but more information is needed about the perpetrators in order to have a fuller understanding of this crime. The very nature of IPSV – sexual assault within a relationship – means that professionals who work with victims must understand the dynamics of perpetrators as well. This new book will distill the knowledge that exists about perpetrators of IPSV. It includes chapters by authors who have worked directly with IPSV perpetrators and covers important subjects such as addressing IPSV in batterer groups, police management strategies, the danger of IPSV to children, the different types of violence perpetrators use, and prevention approaches for young people. There is also still a widely held view that rapists are strangers in alleyways. This book is intended to educate professionals about who is a perpetrator, as well as to highlight the very real danger these perpetrators represent, including a heightened risk of lethality. The contributors look at the social context of IPSV and the implications for prevention and provide hands-on knowledge to practitioners in a number of fields. The book may also be used within the academic context in fields such as social work, sociology, counseling, psychology, medicine, nursing, criminal justice, and law.