BACKGROUND: Adolescence is a period of growth and development that occurs dynamically and rapidly both physically, psychologically, intellectually, socially, and sexual behavior that is associated with the onset of puberty. Health problems in adolescence are one of the important problems in the lifecycle. One of the health problems of adolescents today is sexual conduct before marriage. This behavior is a sexual behavior that is very risky to cause unwanted pregnancy problems, and risks causing various diseases such as sexually transmitted diseases, and even HIV/AIDS. AIM: The aim of the study was to describe dating behavior and age at first having premarital sexual relations for adolescent boys in Indonesia in 2017. METHODS: This study uses data from the Indonesian Demographic Health Survey (SDKI) in 2017 with the number of male respondents who are not married aged 15–24 years as many as 12,523 person. RESULTS: The results showed that more adolescents who are dating are 7047 people (56.3%) compared to those who are dating who are as many as 5476 people (43.7%). The most age at first having sexual relations with young men is at the age of 17 years, namely, as many as 254 people (20.2%), while the age at first having sexual relations with young at least is at the age of 11 years, as many as two people (0.2%). CONCLUSION: It is suggested to the role of parents, schools, health centers, and health offices in providing information related to comprehensive reproductive health education.