This study examines the relationship between the role of peers and the sexual knowledge of junior high school (SMP) students in Batusangkar. The study employed a quantitative approach with a correlational design. The sample consisted of 120 students in grades 7–9, aged 13–15 years, selected using purposive sampling. The research instruments included a peer group scale developed based on Shaffer’s (1994) theory and a sexual knowledge scale based on Reinisch and Beasley’s (1990) theory. Data analysis utilized the Spearman Rank correlation test. The results indicated a very strong positive relationship between the role of peers and adolescents’ sexual knowledge (r = 0.844; p < 0.05). Based on these findings, it can be concluded that peers play a significant role in sexual knowledge. These results underscore the importance of peers as a significant source of information for adolescents in understanding sexual issues. Furthermore, the findings of this study are expected to serve as a foundation for developing more effective sexual education programs tailored to the needs of adolescents in junior high schools.
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