Abstract:
Background: The risk of sexual activities among adolescents is high in globally. Unwanted pregnancy, sexual transmitted infections, and HIV are still the big problem in adolescents. This study was involved to exam the prevalence and factor associated with sexual activities among high school students. Methods: A cross-sectional study was conducted around 145 male students and 315 female students. The total populations was 460 students with multistage random sampling technique. A self-reported questionnaire was used including Illustrative Questionnaire for Interview-Surveys with Young People, Sexual Activity Scale and Sex Education Inventory. Descriptive statistics, Chi-square test, and multivariate logistic regression were used to analyze the data. Results: The prevalence and factor associated with sexual activities were separated 4 groups to be 60.8% of male students, 21.4% of female students, 32.9% of rural area, and 35.2% of urban area. Factor associated with sexual activities where were to be significant association in the bivariate analysis pornography p<0.001, substance use p<0.001, and smoking p<0.001, accessed sexual activities by internet p<0.001. In the multivariate analysis, pornography [OR: 7.50, 95% CI = 2.50-22.50], knowledge of reproductive health [OR: 6.49, 95% CI= 2.29-18.35], substance use [OR: 2.67, 95% CI= 1.02-6.97) conducted significant factor associated with sexual activities among high school students. Conclusions: The comprehensive sexual and HIV-AIDS education programs are extremely needed for adolescents. To provide some availability learning services, including health clinic for young people and community.