Study: Teens Aren't Using Condoms

Sexual activity is on the rise among U.S. teens while the use of contraceptives is sliding in the other direction, according to a study released by the Centers of Disease Control and Prevention.

Findings from the 2007 Youth Risk Behavior Surveillance System show that approximately 48 percent of high school teens say they have had sex, representing 2 percent hike since 2005.

The same survey showed a 2 percent drop-off in the percentage of teens who said they used condoms while having sex.

The CDC questioned 14,041 students in grades nine through 12 in 39 states in the spring of 2007 on a range of risky behaviors, including sexual activity, and drug and alcohol use.