Skip directly to search Skip directly to A to Z list Skip directly to navigation Skip directly to page options Skip directly to site content

Sexual Risk Behaviors: HIV, STD, & Teen Pregnancy Prevention

	diverse group of teens in school hallwayMany young people engage in sexual risk behaviors that can result in unintended health outcomes. For example, among U.S. high school students surveyed in 20151

  • 41% had ever had sexual intercourse.
  • 30% had had sexual intercourse during the previous 3 months, and, of these
    • 43% did not use a condom the last time they had sex.
    • 14% did not use any method to prevent pregnancy.
    • 21% had drunk alcohol or used drugs before last sexual intercourse.
  • Only 10% of sexually experienced students have ever been tested for human immunodeficiency virus (HIV).*

Sexual risk behaviors place adolescents at risk for HIV infection, other sexually transmitted diseases (STDs), and unintended pregnancy:

  • Young people (aged 13-24) accounted for an estimated 22% of all new HIV diagnoses in the United States in 2014.2
  • Among young people (aged 13-24) diagnosed with HIV in 2014, 80% were gay and bisexual males.2
  • Half of the nearly 20 million new STDs reported each year were among young people, between the ages of 15 to 24.3
  • Nearly 250,000 babies were born to teen girls aged 15–19 years in 2014.4

To reduce sexual risk behaviors and related health problems among youth, schools and other youth-serving organizations can help young people adopt lifelong attitudes and behaviors that support their health and well-being—including behaviors that reduce their risk for HIV, other STDs, and unintended pregnancy. The National HIV/AIDS Strategy calls for all Americans to be educated about HIV. This includes knowing how HIV is transmitted and prevented, and knowing which behaviors place individuals at greatest risk for infection. HIV awareness and education should be universally integrated into all educational environments.

*CDC recommends all adolescents and adults 13-64 get tested for HIV at least once as part of routine medical care.

CDC Programs & Initiatives

CDC's Division of Adolescent and School Health addresses HIV, other STDS, and teen pregnancy through

Abstinence from vaginal, anal, and oral intercourse is the only 100% effective way to prevent HIV, other STDs, and pregnancy. The correct and consistent use of male latex condoms can reduce the risk of STD transmission, including HIV infection. However, no protective method is 100% effective, and condom use cannot guarantee absolute protection against any STD or pregnancy.


  1. CDC. Youth Risk Behavior Surveillance—United States, 2015. MMWR 2016;65(SS-6).
  2. CDC. Diagnoses of HIV Infection in the United States and Dependent Areas, 2014. HIV Surveillance Report 2014, vol. 26; November 2015.
  3. CDC. Sexually Transmitted Disease Surveillance 2014. Atlanta: U.S. Department of Health and Human Services; 2015
  4. Hamilton BE, Martin JA, Osterman MJK, et al. Births: final data for 2014. National Vital Statistics Report Rep 2015; 64(12):1-64.