Purpose: In this study the fitness of a path model on sexual risk behavior in adolescents was examined including the relationship of the following sensation seeking, parent-adolescent communication, exposure to pornography, friends` attitudes to sex, attitudes to sexual behavior, sexual permissiveness, perceived behavioral control, and sexual behavioral intention. Methods: The participants were 354 adolescents. Data were analyzed using the SPSS and AMOS programs. Results: Parent-adolescent communication, exposure to pornography, friends` attitudes to sex, and sexual behavioral intention showed a direct effect on sexual risk behavior in adolescents, while sensation seeking, exposure to pornography, friends` attitudes to sex, attitudes to sexual behavior, sexual permissiveness, and perceived behavioral control showed an indirect effect on sexual risk behavior in adolescents. The modified path model of adolescent`s sexual risk behavior had a good fit with the data. Conclusion: Based on the outcomes of this study, it is necessary to design intervention programs that emphasize increasing parent-adolescent communication, perceived behavioral control, and sexual behavioral intention and reducing exposure to pornography, friends` attitudes to sex, attitudes to sexual behavior, and sexual permissiveness in order to decrease adolescent`s sexual risk behavior.