83 p-ISSN : 2354 8428 | e-ISSN: 2598 8727 Jurnal Keperawatan Komprehensif Vol. 7 No.2 July 2021 https://doi.org/10.33755/jkk Original Article Application of Health Belief Model (HBM) on Sexual Behavior in Teens in Senior High School 3 Pasundan Cimahi Dwi Hastuti 1* │ Fifi Siti Fauziah 2 1 *Pediatric Nursing, Stikes Achmad Yani Cimahi, Cimahi, Jawa Barat, Indonesia 2 Psychiatric Nursing Stikes Achmad Yani Cimahi, Cimahi, Jawa Barat, Indonesia *contact dwi.hastuti@gmail.com Received : 05/04/2021 Revised : 03/06/2021 Accepted : 16/07/2021 Online : 23/07/2021 Published : 31/07/2021 Abstract Adolescent growth and development is a process or stage of change or transition from childhood to adulthood marked by various changes, including physical changes. One of the prominent characteristics of the physical changes in the active operation of the sex glands is a sexual urge. Adolescent sexual behaviour can also have psychological and social impacts. To avoid unhealthy sexual behaviour, efforts are made to prevent adolescent sexual behaviour that can be done internally and externally. Internally, the factor that plays an important role for adolescents in preventing sexual behaviour is self-control. The self-control factors can be studied with Health Belief Model (HBM) approach using a psychological model to predict the causes of healthy behaviour. This research method is a quantitative research using a quasi-experimental research with the type of design one group pre and post intervention. The results showed that sexual behavior before the implementation of HBM was unhealthy with a median value of 1, after the implementation of HBM, adolescent sexual behavior was healthy with a median value of 0. This indicates that there is a relationship between the application of HBM and adolescent sexual behavior in SMK Pasundan 1 Cimahi with p-value 0.002. The application of HBM can reduce unhealthy sexual behavior as a guide for adolescents in increasing knowledge, providing information to increase understanding of healthy sexual behavior. Keywords Adolescents, Health Belief Model (HBM), Sexual Behavior. INTRODUCTION Adolescence is a period of transition from childhood to adulthood. In this definition, three criteria are stated, namely biological, psychological, and socio- economic (1). The characteristics of physical changes in adolescents are the work that supports sex becomes a sexual behaviour. This sexual drive is linked to sexual behaviour. Adolescents generally experience a surge in libido due to physical changes at puberty, therefore if it is not equipped with sexual knowledge and is fortified with morals, adolescents with high libido tend to engage in sexual activity, leading to irresponsible sexual behavior (2). Sexual behaviour is supported by sexual behavior, both with the opposite and the same sex. The behavior forms cover from feelings of