The aim of this study was to investigate the variables influencing risky sexual behaviors of heterosexual male Turkish university students. The sample of the study consisted of 382 university students studying at Ankara University and METU. As measurement instruments demographic questionnaire, sexual sensation seeking scale, sexual risk-taking scale, religious attitude scale, HIV knowledge scale, self-efficacy scale for AIDS prevention and Bem sex-role inventory were used. In addition to descriptive analysis, correlation and regression analyses were used. Findings showed that participants' age, having sexually transmitted infection other than HIV, getting HIV test, sexual sensation seeking level and masculinity positively predicted sexual risk taking behavior. Using condom in first intercourse, condom use self-efficacy, and the femininity negatively predicted sexual risk-taking behavior. Findings once more proved protective effect of lifelong condom use.