Social changes and technological developments in the modern era have had a significant impact on adolescent behavior, including in the sexual aspect. Sex education is one of the strategic efforts to prevent free sex, which has the potential to cause various risks such as unwanted pregnancy, the spread of sexually transmitted diseases, and mental health disorders. This study aims to examine the role of sex education in preventing free sex in adolescents in the Modern Era. The type of research used was a literature review, with the collection of articles from two main sources, namely Google Scholar and Garuda. Inclusion criteria applied included articles published between 2019 and 2024, in Indonesian or English, and articles available in open access or full text format. Based on the analysis of articles that meet these criteria, it shows that sex education carried out comprehensively through schools, families, and communities can improve adolescents' understanding of body boundaries, reproductive health, and the consequences of unhealthy sexual behavior. However, the main obstacles such as cultural inappropriates, lack of parental literacy, and the negative influence of digital media are still a challenge in its implementation. The conclusion of this study confirms the importance of multi-stakeholder cooperation in designing sex education programs that are relevant and based on moral and religious values. The development of digital-based education technology is also an opportunity to reach adolescents in various layers of society.
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