The number of young people who have had sex at an early age increases in proportion, it concerns unsafe sexual behaviors, teenage pregnancy, HIV aids and sexually transmitted infections (STIs). This study examines the health behaviors and factors predicting sexual risk behaviors pertaining to teenage pregnancy among adolescents in Thailand. Adolescents consulted the reproductive health center about problems with the same gender. The factors of adolescent reproductive behaviors were significantly associated with age, education level, and the perception of peer norms. Receiving social support from media information also significantly correlated with those behaviors. The results recommend that to prevent premature pregnancy, adolescents should protect themselves. Parents should take the issue of social media use by their teenagers very seriously.