Sexual behavior problems are still developing in Manado, shown by newspaper reports of rape and anecdotes by individuals of premarital intercourse. Pornography exposure also has become a phenomenon in Manado, with some media providing free pornographic material for easy access. Preliminary study shows that in SMAN 9 Manado, both of these phenomena have also appeared. The main research purpose is to examine the correlation between pornography exposure and sexual behavior of adolescents in SMAN 9 Manado. This research uses cross sectional method. The population consists all of students in SMAN 9 Manado with sample size 138 students. The result shows that a majority of the respondents have low frequency of pornography exposure and good sexual behavior. Chi Square test shows a correlation between pornography exposure and sexual behavior (p value = 0.000). To prevent adolescents from having negative sexual behavior, it is recommended that parents and school can carry out supervision and also give proper education for the adolescents