The dramatic increase in child pornography offenses over the past 10 years is directly related to the availability of such material on the Internet. Child pornography can be found on the Web, in newsgroups, and on peer-to-peer networks (the most common source at present). Offenders are a heterogeneous group, with different motivations and levels of risk. The possibility of crossover to a contact sexual offense exists, depending on the presence of other risk factors. Possession of child pornography without a history of contact offenses does not appear to increase the risk of future contact reoffending.