Several risk factors have been identified for adolescent sex offenders and non-sex offenders. Such risk factors include physical and/or sexual abuse, and exposure to community and/or domestic violence. Additionally, the presence of disinhibitive factors, such as substance use and exposure to violent or pornographic media are also commonly reported in the backgrounds of both sex and non-sex offenders. Similarly, adolescent offenders have reported traumatic reactions to environmental factors such as abuse and violence. Similarities in exposure to the risk and disinhibitive factors described above between adolescent sex and non-sex offenders do not provide an explanation for why some adolescents commit sex offenses, whereas other adolescent offenders do not. This study investigated the discriminative ability of traumatic reactions as a risk factor between male adolescent sex and non-sex offenders. The inclusion of traumatic reactions increased the accuracy of risk factors distinguishing between sex and non-sex offenders. Thus, not only the presence of risk factors, but also the adolescent's reaction to the risk factors, are important predictors of whether he will commit a sexual offense.