The period of adolescence is a period where many changes are taking place, and the most intensive changes are on sexual development. Aware of changes that are happening, teenagers are becoming more intrested in sexuality and at that age they become sexually active. As young people who explore something new, they don't have enough knowledge, informations and experience so they are engaging in risky sexual behaviors. Risky sexual behavior is the potential of negative effects caused by sexual activities. The aim of this paper work is to get acquainted with the concept and types of risky sexual behaviors that are manifested in adolescence as well as the consequences of such behaviors as well as important factors in the environment of adolescents that may affect their risk behavior. This paper work describes two risky sexual behaviors that are most commonly reported in adolescents, and this is a sexual relationship under influence of alcohol and sexual intercourse without protection. By engaging in risky sexual relationships, there is a great potential for negative consequences such as: pregnancy, sexually transmitted diseases and sexual victimization. That what can trigger and be the cause of risky sexual behavior of adolescents are risk factors that can be at an individual level, then the risk factors on the side of a narrower environment involving the family and peers, as well as social level and social standards.