An intensive family- and community-based treatment that addresses the multiple causes of serious antisocial behavior across key systems within which youth are embedded (family, peers, school, and neighborhood) for adolescent sexual offenders, ages 12-18. The program for sexual offenders (MST-PSB) focuses on aspects of a youth’s ecology that are functionally related to the problem sexual behavior and includes reduction of parent and youth denial about the sexual offenses and their consequences; promotion of the development of friendships and age-appropriate sexual experiences; and modification of the individual’s social perspective-taking skills, belief system, or attitudes that contributed to sexual offending. The intervention is individualized for each family; families are provided family therapy, youth are provided individual therapy and services are delivered over a period of 5-7 months. Therapists have 3-5 families on their caseloads, and rotating members of the team are available to respond to crises 24 hours a day, 7 days a week.