Teens who took comprehensive sex-education classes in school were 60% less likely to have become pregnant or to have impregnated someone else and were no more likely to have greater rates of sexual behavior or sexually transmitted diseases than teens without formal sex education, according to a new analysis of research data. Meanwhile, there was no clear benefit from abstinence-only education in preventing pregnancy or delaying sexual intercourse. In addition, there was no evidence that comprehensive sex education increased the likelihood of teen sex or boosted rates of sexually transmitted diseases.
Kohler, P., Manhart, L., & Lafferty, W. (2008). Abstinence-Only and Comprehensive Sex Education and the Initiation of Sexual Activity and Teen Pregnancy
Journal of Adolescent Health, 42(4), 344-351.