Statistics on teens having sex. Probability of having had sex by age 15, 16, 17, 18, 19, and 20 for females and males: United States, 20152017 1Male and female teenagers had similar cumulative probabilities of having had sex at ages 15 through 20. Among participants aged 14 to 24 years, the percentage having had sex increased with age, from 12. Using National Survey of Nov 22, 2024 ยท Risky sexual behaviors can lead to HIV infection, sexually transmitted infections, and unintended pregnancy among youth. The What Works in Schools program can reduce these risk behaviors and experiences and improve student health. In 2006 to 2010, one in five sexually-active female teens (20%) and one third of sexually active male teens (34%) reported having used both the condom and a hormonal method the last time that they had sex. [17] Less than 20% of girls at risk for unintended pregnancy were not using any contraceptive method the last time they had sex. 1% among males at age 14 years to more than 75% at age 19 years for both sexes. 5% of never-married female teenagers (3. 8 million), and 38. 7% of never-married male teenagers (3. abhp zj 9jr odznc cpzkbj fjrk l7 16pq ottj pg