This paper deals with the issue of including in the same therapeutic group in a prison setting two (or more) young people who participated in the same gang rape. We provide a background for group therapy with adolescent sex offenders and point out the characteristics of group rape. In addition, we describe the uniqueness of working in a prison as opposed to working in the community or other settings outside the home. Characteristics of adolescent sex offenders and the group process provide a rationale against the inclusion in the same therapeutic group of two youths who committed a rape together. However, our observations during eight years of clinical experience and research in the prison clarify why it can and should be done.