Introduction Sexual interest toward prepubescents and pubescents (pedophilia and hebephilia) constitutes a major risk factor for child sexual abuse (CSA) and viewing of child abusive images, i.e., child pornography offenses (CPO). Most child sexual exploitation involving CSA and CPO are undetected and unprosecuted in the “Dunkelfeld” (German: “dark field”). Aim This study assesses a treatment program to enhance behavioral control and reduce associated dynamic risk factors (DRF) in self-motivated pedophiles/hebephiles in the Dunkelfeld. Methods Between 2005 and 2011, 319 undetected help-seeking pedophiles and hebephiles expressed interest in taking part in an anonymous and confidential 1-year-treatment program using broad cognitive behavioral methodology in the Prevention Project Dunkelfeld. Therapy was assessed using nonrandomized waiting list control design (n = 53 treated group [TG]; n = 22 untreated control group [CG]). Main Outcome Measures Self-reported pre-/posttreatment DRF changes were assessed and compared with CG. Offending behavior characteristics were also assessed via self-reporting. Results No pre-/postassessment changes occurred in the control group. Emotional deficits and offense-supportive cognitions decreased in the TG; posttherapy sexual self-regulation increased. Treatment-related changes were distributed unequally across offender groups. None of the offending behavior reported for the TG was identified as such by the legal authorities. However, five of 25 CSA offenders and 29 of 32 CPO offenders reported ongoing behaviors under therapy. Conclusions Therapy for pedophiles/hebephiles in the Dunkelfeld can alter child sexual offending DRF and reduce-related behaviors. Unidentified, unlawful child sexual exploitative behaviors are more prevalent in this population than in officially reported recidivism. Further research into factors predictive of problematic sexual behaviors in the Dunkelfeld is warranted.

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Hebephilia can be differentiated from pedophilia in terms of sexual interest for the body age of the minor. Associated personal distress, deviant personality characteristics as well as sexual behavior problems suggest that hebephilia can fulfill the criteria of a sexual disorder which should be considered in classification systems (DSM, ICD).

Hebephilia is a sexual disorder, but cannot be independently coded in the presently valid classification systems (DSM-IV-TR and ICD-10). Plans to separately include this in future in the DSM-5 represent an important step from a sexological point of view.