RecruitingBehavioural interventionEvaluation of Peer Group Connection - Middle SchoolThis study is a randomized controlled trial to assess the impact of the Peer Group Connection - Middle School (PGC-MS) intervention on pre-sexual behaviors and sexual initiation in middle school-aged youth. The primary research questions it aims to answer are: 1. What is the impact of the offer to participate in PGC-MS relative to the control group on participants' reported initiation of sexual intercourse at sixteen months post-intervention? 2. What is the impact of the offer to participate in PGC-MS relative to the control group on participants' reports of ever smoking a cigarette at four months post-intervention? 3. What is the impact of the offer to participate in PGC-MS relative to the control group on participants' reports of ever using an electronic vapor product at four months post-intervention? 4. What is the impact of the offer to participate in PGC-MS relative to the control group on participants' reports of ever having a drink of alcohol at four months post-intervention? 5. What is the impact of the offer to participate in PGC-MS relative to the control group on participants' reports of ever using marijuana at four months post-intervention? Researchers will compare participants randomized to receive PGC-MS (treatment group) to participants randomized to class-as-usual (which contains no sexual or reproductive health information (control group)). Participants randomized to the treatment group will be offered PGC-MS over the course of their transition year into middle school (6th grade). Participants randomized to the control group will be offered class-as-usual.