Abstract Background: In many countries, negative social attitude towards sensitive issues such as sexual behavior has resulted in false and invalid data concerning this issue. This is an analytical cross-sectional study, in which a total number of 1500 single students from universities of Shahroud City were sampled using a multi stage technique. The students were assured that their information disclosed for the researcher will be treated as private and confidential. The results were analyzed using crosswise model, Crosswise Regression, T-test and Chi-square tests. Findings: It seems that the prevalence of sexual behavior among Iranian youth is 41% (CI = 36-53). Conclusion: Findings showed that estimation sexual relationship in Iranian single youth is high. Thus, devising training models according to the Islamic-Iranian culture is necessary in order to prevent risky sexual behavior.