Empowering high school students as peer counselors to prevent free sex and early marriage

counseling in schools can be the right choice in an effort to fortify adolescents from negative environmental influences and play a role in promoting the issues of free sex, early marriage, and reproductive health through counseling activities. The activity was carried out using the training method, in August 2023. The location of the activity was SMA Negeri 15 Surabaya, with the target participants being 2 representatives of class X and XI students, totaling 48 students. The instruments used in this activity are pre-test and post-test, with the main material of counseling on free sex, early marriage, reproductive health, and skills to become peer counselors. The success indicator of this activity, where >50% of participants get a minimum point increase of 5%. Community service activities through peer counseling training were successful in fulfilling activity success indicators. >50% of participants got an increase in points of at least 5% after training; namely, a total of 26 (54.17%) participants experienced an increase in knowledge scores of more than 5%. The training activities that have been carried out are effective in increasing the knowledge of participants.