Addresses the personality dynamics of the sex offender and the distortions that take place in male gender role socialization. Boundary management in group psychotherapy with incarcerated rapists and child molesters is focused on, and the author provides excerpts from clinical experience with this population to illustrate important aspects of this treatment. Topics discussed include: the sex offender (personality dynamics, differences between rapists and pedophiles); sex offender treatment; managing the boundaries (external boundaries, effects of male gender role socialization on boundary management, and internal boundaries); the sex offender in group therapy (boundaries violations within group, group cohesion, transference, and change in the sex offender); and effects on the therapist. (PsycInfo Database Record (c) 2020 APA, all rights reserved)