Have you ever wondered. Am I normal? (and what is "normal," anyway?) What's up down there? I really like girls, but I like boys sometimes, too. Am I gay, bisexual, or just messed up? Are we both really ready to have sex? Is it ok if I masturbate? I feel like I can't ever say no to my partner. What's the problem? Heather Corinna and Scarleteen.com have been providing sex education and information for young adults, parents, and mentors for nearly ten years. Whether you're straight, gay, sexually active, or just plain curious, S.E.X.

spells out everything you need to know, including: A sexual readiness checklist Illustrations of female and male reproductive anatomy How to love your body, even when it's changing every day Tips on safer sex for body, heart, and mind An in-depth birth control breakdown How to create and enjoy the relationships that are right for you Popular mechanics of partnered sex: sexual activities explained, including pregnancy and STI risks STIs 101: what they are and how to keep yourself from getting them.