In this, the sixth book in Brynie's award-winning 101 QUESTIONS... series, the author answers briefly and honestly the best of the questions about sex and sexuality she collected from hundreds of teenagers over more than three years. The questions range from "What is sexuality?" to "How can I know if I have an organsm?" She reviews what scientific studies have revealed about attractiveness and mate selection, homosexuality, masturbation, the brain activity that evokes sexual responses, and more. She presents statistics on teen sexual activity and points out that teens are choosing NOT to have sex more often than ever before. This is a science book, not a book of advice. It tells young readers what they need to know to better understand their sexuality and to make informed choices about it. The book includes an extensive glossary, list of organizations and publications, and index.