The world in which young people grow up today is very different from that of their parents or grandparents.This may be especially true in developing countries. Compared with the youth of past generations, young people today have more opportunities and challenges. They are likely to have more independence from their parents and spend more time in school. They are likely to have widespread access to the radio and television and, increasingly, to the Internet and mobile phones. They are also entering adolescence earlier and healthier, postponing marriage and child-bearing until later, and are more likely to have sex before marriage. (1) In response to these major societal changes, educators, researchers, policymakers and parents alike have become increasingly interested in the potential for sexuality education to help meet the needs of young people. The quality and quantity of evaluation research in this field has improved dramatically over the last decade, and there is now clear evidence that sexuality education programs can help young people to delay sexual activity and improve their contraceptive use when they begin to have sex. Moreover, studies to date provide an evidence base for programs that go beyond just reducing the risks of sexual activity--namely, unintended pregnancy and sexually transmitted infections (STIs)--to instead address young people's sexual health and well-being more holistically.