Sexual abuse by juveniles is widely recognized as a significant problem. As communities have become more aware of juvenile sex offending they have responded with increasingly severe responses. This is despite recidivism data suggesting that a relatively small group of juveniles commit repeat sexual offenses after there has been an official response to their sexual offending. Research has shown that juveniles who commit sexual offenses are a heterogeneous mix, varying according to a wide range of variables. This article provides an overview of the characteristics of youths who have committed sex offenses. Factors that will be discussed include types of offending behaviors, family environment, histories of child maltreatment, social skills and interpersonal relationships, sexual knowledge and experiences, academic and cognitive functioning, and mental health. (Contains 1 table.)