American Congress of Obstetricians and Gynecologists (ACOG) is a nonprofit organization of professionals who provide health care for women, including teens. The ACOG Resource Center publishes manuals and patient education materials. The Web publications section of the site has patient education pamphlets on many women's health topics, including reproductive health, breast-feeding, violence, and quitting smoking.

The National Institute of Child Health and Human Development (NICHD) is part of the U.S. National Institutes of Health. The NICHD conducts and supports research related to the health of children, adults, and families. NICHD has information on its Web site about many health topics. And you can send specific requests to information specialists.

The Office on Women's Health is a service of the U.S. Department of Health and Human Services. It provides women's health information to a variety of audiences, including consumers, health professionals, and researchers.

The Planned Parenthood Federation of American provides comprehensive reproductive health care and consumer information about family planning, sexual health, and sexually transmitted diseases (STDs).

The Teen Talk Web site (www.plannedparenthood.org/teen-talk) has information for teens about dating, teen pregnancy, sexual orientation, gender identity, how teens can protect themselves against STDs, and more.