Adolescent risky sexual behavior has led to an increase in early marriage and unwanted pregnancies. This study aimed to determine the relationship between knowledge levels and parental roles in preventing risky sexual behavior among adolescents at SMA Negeri 3, Bengkulu City. The research design used an analytical survey with a cross-sectional design. The population of this study was all 1,315 students at SMA Negeri 3, Bengkulu City, in the 2025-2026 academic year. A sample of 93 respondents was drawn using cluster sampling techniques. Data analysis was performed using univariate and bivariate analysis. The univariate analysis revealed that almost half (41 respondents) (44.1%) had poor knowledge, the majority (48 respondents) (51.6%) had poor parental roles, and the majority (51.8%) had good knowledge in preventing risky sexual behavior among adolescents. The bivariate analysis revealed a relationship between knowledge and preventing risky sexual behavior among adolescents at SMA Negeri 3, Bengkulu City (p-value = 0.000). There is a relationship between parental role and the prevention of risky sexual behavior in adolescents at SMA Negeri 3, Bengkulu City (p-value = 0.000). The results of this study are expected to provide input for the study's host school in developing evidence-based operational policies regarding reproductive health, particularly risky sexual behavior.
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