ge sexual behavior, or should we acknowledge that many teens are sexually active, and prepare them against the negative consequences? Emotional arguments can get in the way of an unbiased assessment of the effects of sex education.Other countries have been much more successful than the US in addressing the problem of teen pregnancies. Age at first intercourse in similar in the US and five countries have teen pregnancy rates that are at least less than half the US rate. Sex education in these other countries is based on the following components: a policy explicitly favoring sex education; openness about sex, consistent messages throughout society, and access to contraception.Reducing the Risk, a program for high school students in urban and rural areas in California, used behavior theory-based activities to reduce unprotected intercourse, either by helping teens avoid sex or use protection. Ninth and 10th graders attended 15 sessions as part of their regular health education classes and participated in role-playing and experimental activities to build skills and self-efficacy. As a result, a greater proportion of students who were abstinent before the program successfully remained abstinent, and unprotected intercourse was significantly reduced for those students who became sexually active.Postponing Sexual Involvement, a program for African-American 8th graders in Atlanta, GA, used peers (11th and 12th graders) to help youth understand social and peer pressures to have sex, and to develop and apply resistance skills. A unit of the program also taught about human sexuality, decision-making, and contraceptives. This program successfully reduced the number of abstinent students who initiated intercourse after the program, and increased contraceptive use among sexually experienced females. Healthy Oakland Teens (HOT) targets all 7th graders attending a junior high school in Oakland, CA. Health educators teach basic sex and drug education...