Reproductive health education plays a crucial role in individual well-being. This study aims to explore the impact of free sex on reproductive health, with a specific focus on the increasing cases of HIV/AIDS. A proposed solution is the implementation of comprehensive sex education. The research objectives include examining the effects of early marriage on reproductive health, evaluating the prevalence of HIV/AIDS resulting from inadequate sex education, and assessing the effectiveness of comprehensive sex education. In terms of research methodology, a mixed-methods approach was employed, involving both surveys and in-depth interviews. The data analysis encompassed statistical methods and thematic qualitative analysis. The findings of the research indicate that early marriage contributes significantly to heightened reproductive health risks, closely associated with the prevalence of HIV/AIDS. Participants who underwent comprehensive sex education demonstrated a superior understanding of reproductive health and exhibited more favorable behavior, underscoring the positive role of such education in reducing risks. This study provides valuable insights into the impacts of early marriage and highlights the success of comprehensive sex education. The implications for policies and intervention measures are crucial for enhancing community well-being.