Child sexual abuse is a large-scale global problem, and with the internet and communication technologies enabling new ways to sexually abuse children, the problem is drastically increasing.

Prevent It is a free, anonymous, internet-delivered, therapist assisted, cognitive behavioral therapy (CBT) intervention for individuals concerned about their sexual urges or behaviors involving children. The treatment program is based on many years of clinical experience from working with this patient group, results from several previous research projects.

Using the scientifically rigorous design of a randomized controlled trial with waitlist control, we want to evaluate Prevent It 2.0 - an updated cognitive behavioral therapy treatment for individuals who are concerned about their sexual urges regarding children.

The study design is an academically initiated randomized controlled clinical trial where Prevent It 2.0 is compared with waitlist control. Participants in the waitlist control will wait thirteen weeks before starting active treatment. While on the waitlist, participants will respond to questions about ongoing problematic sexual behavior.

Recruitment will be carried out through multiple channels, and takes place on both "Darknet" and "Clearnet". All contact with participants, the treatment, evaluations, and termination of the contact, is conducted via the online treatment platform Iterapi, designed specifically for clinical trials of Internet-mediated CBT.

The treatment contains nine modules over thirteen weeks and the content of the therapy is classic CBT.

Inclusion Criteria:

• concern about sexual urges regarding children
• Informed consent to participate

Exclusion Criteria:

• Participants with a severe psychiatric illness (such as high acute suicide risk or severe substance abuse)
• Participants that are judged to have a limited understanding of the languages that the treatment is delivered in (English)
• Lack serious intention to participate (assessed by the researcher/therapist during the intake interview, which lasts approximately one hour)

Individual participant data that underlie the results reported in each respective article, after deidentification (text, tables, figures and appendices). Fully deidentified participant data will be shared in a public repository without demographic information. Data with demographic information will be shared with an approved data access agreement.

For data shared through a data access agreement, beginning 3 months and ending 5 years following each article publication. Data shared in a public repository will be available immediately following each article publication and will be available for at least 5 years.

For data that contain demographic information, investigators who provide a methodologically sound proposal, and whose proposed use of the data has been approved by an independent review committee identified for this purpose. Any researcher may access the version of the data available in a public repository.

• For what types of analyses? To achieve aims in the approved proposal and for meta-analysis
• By what mechanism will data be made available? Proposals should be directed to Christoffer.rahm@ki.se. To gain access to the data with demographic information, data requesters will need to sign a data access agreement. Data will be made available digitally via a secure data transfer facility provided by Karolinska Institute. Fully deidentified data without demographics will be made available on the Open Science Framework (osf.io).