But since you are asking about facts and not just how things appear on the surface, you may be surprised to hear that the numbers tell a different story. According to the Centers for Disease Control’s (CDC) National Youth Risk Behavior Survey from 1991 to 2005, the percentage of teens who had ever had sexual intercourse actually decreased over the past fifteen years. Huh? That’s right, recent trend data shows that there are fewer teens having sex, not the other way around. What’s more, the survey also found that more teens had abstained from sexual activity in the previous three months, fewer had four or more sexual partners in their lifetime and condom use had increased.