Specialists in adolescent medicine collaborate in a discussion of physical development and emotions--with topics covering reproductive systems, individual sexuality, hygiene, sexual activities, contraception, pregnancy, abortion, sexually transmitted diseases (including AIDS), sexual identity, abuse, sex as related to drugs and alcohol, and fertility. Most helpful on factual information: a step-by-step description of a gynecological exam, causes of menstrual cramps, deemphasizing penis length, and such unfamiliar information as the fact that secretions from the Cowper's glands might cause pregnancy. The tone is impersonal; questions and answers are brief, even curt, so that problems of real concern (wet dreams, or how to go about discussing a potential partner's sexual history) are given short shrift. But on track as far as it goes--including that key question, ""How can I get someone to like me?"" Glossary, index.