Based on research in various major cities in Indonesia around 20% to 30% of teenagers have had sex. The threat of living patterns of adolescent free sex in general both in lodgings or boarding houses seems to be growing increasingly serious (Medical, 2010). Reproductive health education among adolescents not only provides knowledge about reproductive organs, but also about the dangers of promiscuity, such as sexually transmitted diseases and unwanted pregnancies or high-risk pregnancies. To determine the relationship between adolescent knowledge about Sexually Transmitted Infections and free sex in students at SMAN 1 Wanaraya in 2019.
This study used analytic survey research using a cross sectional study approach. The population in this study were all students and students of SMAN 1 Wanaraya in 2019 which amounted to 514 people, with a sample of 101 students. The sampling technique used was Proportional Stratified Random Sampling.
From the chi square test the results obtained p = 0,000 <(α = 0,005) which means there is a relationship between the knowledge of adolescents about sexually transmitted infections and free sex.
As a consideration for educational institutions, especially schools in determining programs and can disseminate information about sexually transmitted infections and free sex, especially for adolescents who have insufficient knowledge so that adolescents avoid the effects caused by free sex.