At least until the last few years, the proportion of teenagers who have had sex rose steadily, and they are more likely to use contraceptives than their earlier counterparts. Underlying this general trend has been an increase in sexual activity among young teens-ages 15 and under-as well as middle-class and white teenagers. Contraceptive use has risen also, probably because of the fear of AIDS and the increased sexual activity among white and middle-class teenagers. Because more teenagers were using contraceptives, the pregnancy rate per 1,000 sexually active teenagers actually declined during the 1980s, even as more teenagers were having sex. Nevertheless, contraceptive use is far from perfect, leading to high levels of abortion, sexually transmitted diseases, and nonmarital births. The challenge for school-based programs is to pursue two simultaneous goals: lower the level of sexual activity and raise the rate of contraceptive use among those who have sex.