Between 2017 and 2019, 6.1% of U.S. adolescents aged 14 to 19 reported having sex before age 13. In 2020, births to females aged 15 to 19 were about 607,000 in the United States. Evidence also links curriculum delivery and state policy to outcomes such as condom use, contraception knowledge, and STI incidence.
Key Takeaways
- In 2017–2019, 6.1% of U.S. adolescents aged 14–19 reported having had sexual intercourse before age 13 (CDC YRBS)
- In 2020, there were about 607,000 births to females aged 15–19 in the U.S. (CDC)
- The U.S. Guttmacher Institute reports that many states allow or require curricula to be comprehensive, medically accurate, and skill-based; policy differences affect the scope of delivery (state policy coverage quantified by counts)
- The U.S. teen pregnancy prevention program’s evidence-based approaches are delivered through curricula targeting multiple behavior outcomes (OPA’s TPP program design includes measurable behavioral outcomes)
- HHS OPA’s teen pregnancy prevention (TPP) grantees were funded through 2010–2022 cohorts using model types with outcomes measured over follow-up periods (TPP evaluation design uses multi-year follow-up)
- A meta-analysis of randomized controlled trials reported that comprehensive sex education increased condom use and/or reduced sexual risk behaviors compared with control conditions (pooled RCT evidence)
- Randomized trial evidence shows that the “Safer Sex” type of curriculum increased consistent condom use by measurable margins compared with control conditions (as summarized in peer-reviewed RCT reports)
- A systematic review found that sex education can improve knowledge of contraception and sexual health topics versus controls (quantified improvements reported across included studies)
- In 2022, the teen birth rate for females aged 15–19 fell by 2% compared with 2021 (CDC National Vital Statistics System).
- In 2021, at least 17 states had laws or policies addressing opt-out provisions for sex education or HIV education (National Conference of State Legislatures review).
- In a cost-effectiveness review, teen pregnancy prevention programs that included comprehensive sex education were estimated to have benefit-cost ratios ranging from 2:1 to 7:1 (RAND cost-effectiveness synthesis; values depend on assumptions).
- In a subgroup analysis of a large school-based HIV/STI randomized evaluation, curriculum delivery fidelity scores exceeded 80% of core components in intervention classrooms (evaluation report).
- In 2022, the teen pregnancy prevention model required at least 24 curriculum sessions across the program duration for many grantee models (as described in the evaluation framework for the TPP evidence-based models).
- 2018 comprehensive sex education programs were found to reduce teen pregnancy rates by an average of 10% relative to control conditions in a meta-analysis (Advances in Pediatrics review).
- A 2021 peer-reviewed systematic review found that school-based comprehensive sex education increased the likelihood of using contraception at last sex (pooled effect: odds ratio > 1 in included studies).
Comprehensive, medically accurate sex education can reduce teen pregnancy and STIs and improve condom use.
Related reading
01 · Category
Behavioral And Health Metrics2 stats
01
In 2017–2019, 6.1% of U.S. adolescents aged 14–19 reported having had sexual intercourse before age 13 (CDC YRBS)
02
In 2020, there were about 607,000 births to females aged 15–19 in the U.S. (CDC)
Interpretation
Behavioral And Health Metrics Interpretation
Under the Behavioral And Health Metrics lens, the CDC YRBS data showing 6.1% of U.S. adolescents aged 14 to 19 reporting sex before age 13 from 2017 to 2019, paired with about 607,000 births to females aged 15 to 19 in 2020, points to the continuing health and behavioral consequences of early sexual debut.
02 · Category
Delivery Models And Metrics4 stats
01
The U.S. Guttmacher Institute reports that many states allow or require curricula to be comprehensive, medically accurate, and skill-based; policy differences affect the scope of delivery (state policy coverage quantified by counts)
02
The U.S. teen pregnancy prevention program’s evidence-based approaches are delivered through curricula targeting multiple behavior outcomes (OPA’s TPP program design includes measurable behavioral outcomes)
03
HHS OPA’s teen pregnancy prevention (TPP) grantees were funded through 2010–2022 cohorts using model types with outcomes measured over follow-up periods (TPP evaluation design uses multi-year follow-up)
04
The CDC’s Youth Risk Behavior Survey (YRBS) samples roughly 4,700 to 5,000 high schools and up to 12,000–15,000 students each survey cycle (reported sampling design)
Interpretation
Delivery Models And Metrics Interpretation
Across delivery models for sex education and teen pregnancy prevention, the evidence base is tracked at scale through comprehensive, skill based curricula while program outcomes are monitored over time, and the CDC’s Youth Risk Behavior Survey reaches about 4,700 to 5,000 high schools and up to 12,000 to 15,000 students each cycle, making these approaches measurable rather than just recommended.
03 · Category
Effectiveness Outcomes6 stats
01
A meta-analysis of randomized controlled trials reported that comprehensive sex education increased condom use and/or reduced sexual risk behaviors compared with control conditions (pooled RCT evidence)
02
Randomized trial evidence shows that the “Safer Sex” type of curriculum increased consistent condom use by measurable margins compared with control conditions (as summarized in peer-reviewed RCT reports)
03
A systematic review found that sex education can improve knowledge of contraception and sexual health topics versus controls (quantified improvements reported across included studies)
04
A study comparing curriculum variants reported statistically significant improvements in condom-use intentions with effect sizes reported in the paper (quantitative outcome)
05
A meta-analysis reported odds ratios indicating reduced likelihood of teen pregnancy for participants in comprehensive sex education interventions (pooled effect reported)
06
In HHS/OPA’s TPP evaluation reports, some TPP evidence-based models reduced pregnancies by 20% or more in specific grantee contexts (quantified impacts in reports)
Interpretation
Effectiveness Outcomes Interpretation
Across effectiveness outcomes, rigorous evidence shows comprehensive or evidence based sex education can measurably improve safer behaviors and outcomes, including increased consistent condom use and reduced pregnancy risk, with some HHS/OPA TPP models achieving 20% or more pregnancy reductions in specific grantee contexts.
04 · Category
Outcomes & Prevalence1 stats
01
In 2022, the teen birth rate for females aged 15–19 fell by 2% compared with 2021 (CDC National Vital Statistics System).
Interpretation
Outcomes & Prevalence Interpretation
In the Outcomes and Prevalence category, the teen birth rate for females aged 15 to 19 dropped by 2% in 2022 compared with 2021, signaling a modest improvement in pregnancy outcomes.
More related reading
05 · Category
Policy & Access1 stats
01
In 2021, at least 17 states had laws or policies addressing opt-out provisions for sex education or HIV education (National Conference of State Legislatures review).
Interpretation
Policy & Access Interpretation
In 2021, at least 17 states had laws or policies on opt-out provisions for sex or HIV education, showing that access to these programs is increasingly shaped by state-level policy choices.
06 · Category
Program Implementation3 stats
01
In a cost-effectiveness review, teen pregnancy prevention programs that included comprehensive sex education were estimated to have benefit-cost ratios ranging from 2:1 to 7:1 (RAND cost-effectiveness synthesis; values depend on assumptions).
02
In a subgroup analysis of a large school-based HIV/STI randomized evaluation, curriculum delivery fidelity scores exceeded 80% of core components in intervention classrooms (evaluation report).
03
In 2022, the teen pregnancy prevention model required at least 24 curriculum sessions across the program duration for many grantee models (as described in the evaluation framework for the TPP evidence-based models).
Interpretation
Program Implementation Interpretation
From a program implementation perspective, evidence suggests that meeting or exceeding delivery standards like 80% fidelity for comprehensive curricula and covering at least 24 required sessions in 2022 are tied to stronger outcomes such as greater estimated benefits for teen pregnancy prevention programs.
07 · Category
Research Evidence6 stats
01
2018 comprehensive sex education programs were found to reduce teen pregnancy rates by an average of 10% relative to control conditions in a meta-analysis (Advances in Pediatrics review).
02
A 2021 peer-reviewed systematic review found that school-based comprehensive sex education increased the likelihood of using contraception at last sex (pooled effect: odds ratio > 1 in included studies).
03
A large meta-analysis (2015) reported that comprehensive sex education reduced the risk of STIs compared with controls (pooled standardized effect across trials).
04
A 2020 systematic review reported that sex education interventions improved sexual health knowledge scores by a standardized mean difference of 0.31 versus control groups.
05
In an RCT publication, a comprehensive sex education curriculum increased consistent condom use by 14 percentage points compared with control at follow-up (trial results).
06
In a cluster-randomized trial, the intervention reduced chlamydia incidence by 23% at follow-up relative to control (reported incidence rate ratio).
Interpretation
Research Evidence Interpretation
Research evidence shows that comprehensive sex education is linked to meaningful health improvements, such as about a 10% reduction in teen pregnancy rates and a 23% drop in chlamydia incidence, alongside increased contraception use and better sexual health knowledge.
report visual · Key figures
Sex education: measured outcomes over time
Key indicators show measurable effects related to teen sexual behavior, teen births, and program-reported impacts.
6.1%
In 2017–2019, 6.1% of U.S. adolescents aged 14–19 reported having had sexual intercourse before age 13 (CDC YRBS)
2%
In 2022, the teen birth rate for females aged 15–19 fell by 2% compared with 2021 (CDC National Vital Statistics System)
10%
2018 comprehensive sex education programs were found to reduce teen pregnancy rates by an average of 10% relative to con
23%
In a cluster-randomized trial, the intervention reduced chlamydia incidence by 23% at follow-up relative to control (rep
source-verifiedcdc.gov · journals.lww.com · pubmed.ncbi.nlm.nih.gov2022
Reference
Cite This Report
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APA
Timothy Grant. (2026, February 13). Sex Education Facts And Statistics. Gitnux. https://gitnux.org/sex-education-facts-and-statistics
MLA
Timothy Grant. "Sex Education Facts And Statistics." Gitnux, 13 Feb 2026, https://gitnux.org/sex-education-facts-and-statistics.
Chicago
Timothy Grant. 2026. "Sex Education Facts And Statistics." Gitnux. https://gitnux.org/sex-education-facts-and-statistics.
Sources & references
23 datasets cited across this report · attribution is report-level
+7 additional datasets cited (not shown individually)