HealthyChildren.org: Teenage Sexuality
CDC.gov: Adolescent and School Health
MedlinePlus.gov: Teen Sexual Health
ACOG.org: You and Your Sexuality (Especially for Teens)
AimforSuccess.org: Avoiding Sexual Activity
GirlsHealth.gov: Why waiting to have sex makes sense
SafeTeens.org: Waiting, Abstinence and Teens