Promiscuity among teenagers today is increasingly worrying. Adolescents have a great sense of curiosity, like adventure and challenges and tend to dare to take risks for their actions without careful consideration. Free Sexually Transmitted Diseases that occur in adolescents today are the impact of promiscuity. In overcoming this problem, of course the participation of all levels of society, including academics in the field of public health. The method in this activity is in the form of counseling / interactive lectures to students of SMPN II Mereubo. The use of this lecture / extension method with the consideration that is an educated target group so that the opportunity to receive and capture the information presented is quite large. The service activity "education on the dangers of promiscuity against sexually transmitted diseases" through counseling (lectures) with the target of students  SMPN II Meurebo was successfully carried out, resulting in an increase in student knowledge  after counseling.
Keywords: Education, Promiscuity, Sexually transmitted diseases