You can protect your teen's health and future Country to what you may think, research clearly identifies parents as the single most influential factor affecting a teen's sexual decision making. Parental involvement is more critical today than ever, as teens become more vulnerable to at - risk behaviors. By the age of 18:
- 60 percent of teens will have had sexual intercourse
- 25 percent of sexually active teens will have contracted a sexually transmitted disease.
- By the age of 20 nearly one-third of sexually active teen girls have been pregnant.