The paper concludes that sex education programmes that are based on a comprehensive curriculum can delay the onset of sexual activity among adolescents and young people, reduce the frequency of intercourse, reduce the frequency of unprotected sex, reduce the number of sexual partners, and increase condom and contraceptive use. Furthermore, sex education programmes do not increase sexual activity among adolescents and young people and generally result in increased knowledge about human sexuality

From the United Nations Expert Paper on the Impact of Sex Education on the Sexual Behaviour of Young People