This study aims to evaluate the effect of a web-based sexual education and counseling program on adolescents' attitudes toward sexual education and their level of sexual health knowledge. The study was conducted as a randomized controlled trial with adolescents enrolled in high school. Participants in the intervention group received structured web-based sexual education and counseling through an online platform, while the control group received no intervention. Data were collected using validated scales before and after the intervention. The findings of this study are expected to contribute to the development of effective digital sexual health education programs for adolescents.