Subjects were predominantly male, with a mean age of 14.8 years. The most frequently occurring offenses were indecent liberties (59 percent), rape (23 percent), and exposure (11 percent). The six female offenders all committed indecent liberties with children 6 years or less. For all offenders, the majority of victims were children under 12. For rape and indecent liberties, the victim was usually known to the offender, and in many cases, the offense took place while the offender was babysitting. Force, threat, or intimidation were involved in 77 percent of the offenses. There was substantial evidence of prior sexual offending in 56.6 percent of cases, and 44 percent had committed prior nonsexual offenses. In addition, a majority of subjects showed evidence of social isolation and school maladjustment. 3 tables and 19 references.