Most of the teens who answered the SEX, etc. But not everyone agrees. It doesn't matter how much a school does if the parents don't do their part. Those of us who favor mandatory sex education think it can be effective if courses are more informative than academic. With the rapid changes that we go through as teens, many of us also feel that sex education should be taught at an earlier age.
Abstinence is the best way to avoid pregnancy.
AIDS and other sexually transmitted diseases and we need to learn how to say no if someone tries to pressure us into having sex. But teaching only about abstinence is useless to those of us who are already sexually active. Instead, family life courses should teach the variety of decisions a teenager can make regarding sexuality and how to best make them.