Sex Facts and Statistics

Why We Need Better Data on Sexual Health

Here's the thing: sexual health isn't just about preventing disease or understanding mechanics. It shapes our relationships, influences our mental wellbeing, and affects our physical health in ways most people don't fully appreciate. Yet accurate, comprehensive information remains frustratingly hard to find. 

That's where data becomes invaluable. When we look at what the research actually shows,not what we assume or what popular culture tells us,the picture becomes clearer and often surprising. Did you know STI rates dropped 9% in 2024 after years of increases? Or that nearly 7% of Gen Z adults identify as nonbinary? Or that the "ideal" sex duration most couples aim for is actually much shorter than what many people think?

This guide pulls together findings from major research institutions: the CDC's surveillance data, peer-reviewed studies in the Journal of Sexual Medicine, population surveys from Pew Research and the General Social Survey, and clinical trials on everything from testosterone therapy to relationship satisfaction. We've compiled 66 statistics that paint a complete picture of sexual health in 2025, covering safe sex practices, performance expectations, infidelity patterns, gender identity, and how often people are actually having sex (spoiler: it's less than previous generations).

What emerges from this data is reassuring in its own way: there's tremendous variation in sexual behavior, and "normal" covers a much wider range than most people realize. These statistics don't tell you what you should be doing,they show you what's actually happening, backed by rigorous research rather than assumptions.

 

Safe Sex Practices

The CDC's 2024 surveillance data reveals some genuinely good news about sexually transmitted infections:

• More than 2.2 million cases of chlamydia, gonorrhea, and syphilis were reported in the United States in 2024,down 9% from 2023 ¹

• This marks the third straight year of declines, though rates remain 13% higher than they were a decade ago ¹

• Chlamydia dropped 8% from 2023 to 2024, the second consecutive annual decline ¹

• Gonorrhea fell 10% year-over-year, continuing a three-year downward trend ¹

• Primary and secondary syphilis plummeted 22% since 2023, the second year of declining rates ¹

• Nearly 4,000 cases of congenital syphilis were reported in 2024,up 2% from 2023, with rates now 700% higher than a decade ago ¹

• New prevention methods like doxycycline post-exposure prophylaxis (doxy PEP) have helped drive down bacterial STI rates, particularly among men who have sex with men ¹

 

How Long Does Sex Actually Last?

Ask most people how long sex "should" last and you'll get wildly different answers. The research, however, tells a more consistent story.

What the Data Shows

A multinational study tracking 500 couples across five countries measured actual duration:

• The median time from penetration to ejaculation was 5.4 minutes, with a range from 33 seconds to 44 minutes ²

• Sex therapists consider 3 to 7 minutes adequate, 7 to 13 minutes desirable, and anything under 2 minutes potentially worth addressing ²

• Duration decreases with age: 6.5 minutes for men 18-30, 5.4 minutes for ages 31-50, and 4.3 minutes for those over 51 ²

• When asked to estimate, couples guessed around 8 minutes on average, with 10 minutes being the ideal ²

• Women reach orgasm after an average of 13.41 minutes during partnered sex, according to 2020 research ³

• Japanese studies found women wanted an average of 15.7 minutes of intercourse, while the actual average was 13.6 minutes ⁴

• In that same research, 43% of women wanted longer duration, 39% were satisfied, and 18% preferred shorter ⁴

• Neither condom use nor circumcision significantly affected duration in the multinational studies ²

Testosterone and Desire

Low testosterone gets blamed for a lot, but the research shows a more nuanced picture:

• Reduced sexual desire is the clearest sign of low testosterone in men ⁵

• About 19% of community-dwelling men reported low libido at baseline in Massachusetts research ⁵

• Levels below 300 ng/dL are generally considered low, though some specialists use 250 ng/dL as the cutoff ⁵

• Anywhere from 2% to 77% of older men have low testosterone, depending on which definition researchers use ⁵

• In men 65 and older with documented low testosterone, treatment significantly improved sexual desire, erectile function, and sexual activity ⁶

• Multiple analyses confirm that testosterone therapy boosts desire in men with clinically low levels ⁶

• Here's the interesting part: day-to-day fluctuations in normal-range testosterone don't reliably affect desire, suggesting men only need a threshold level rather than higher-is-better ⁶

 

What Happens to Your Body During and After Sex

Beyond the obvious, sexual activity triggers a cascade of physiological responses:

• Men burn roughly 276 calories during 30 minutes of sex, while women burn about 213 calories ⁷

• Sex releases oxytocin, the hormone that builds trust and attachment between partners ⁷

• Sexual activity can boost human growth hormone production, which helps maintain muscle tone and potentially contributes to a more youthful appearance ⁷

• Post-sex nausea or dizziness can stem from hormonal shifts, blood pressure changes, or psychological factors like anxiety ⁷

• Testosterone levels can spike within roughly 15 minutes of exposure to erotic stimuli ⁷

 

Who Cheats More: What the Data Actually Shows

Infidelity research reveals patterns that challenge some common assumptions while confirming others.

The Gender Gap

The General Social Survey, one of the longest-running population studies, provides the clearest picture:

• 20% of married men and 13% of married women report having had sex with someone other than their spouse ⁸

• Among adults 18-29, women are slightly more likely to report infidelity than men: 11% versus 10% ⁸

• The gender gap widens dramatically with age,among those 80+, 24% of men and just 6% of women report cheating ⁸

• Women's infidelity rates peak in their 60s at 16%, while men's peak at 26% in their 70s ⁸

• Among those who strayed, 63.5% of women reported just one affair, compared to 55.4% of men ⁹

• Men who cheated had an average of 2.18 affairs; women averaged 1.72 ⁹

Affair Patterns and Consequences

The Kinsey Institute and other research institutions have documented how affairs unfold:

• 23% of men and 19% of women in relationships have cheated, according to Kinsey data ¹⁰

• About 31% of affairs happen with coworkers, making the workplace the most common setting ¹⁰

• Among people who cheat, 67% of men and 53% of women admitted to multiple affairs ⁹

• Nearly half (47.7%) of people who cheated told their partner within a week, while 25.7% waited six months or longer ⁹

• Those who cheated are far more likely to end up divorced or separated,40% versus 17% of those who remained faithful ⁸

• Religious service attendance is the most consistent predictor of lower infidelity risk for both men and women ⁸

Defining Cheating

Turns out, men and women don't always agree on what counts as infidelity:

• 88% of women consider kissing someone else cheating, compared to 73% of men ¹¹

• 91.6% of women recognize emotional affairs as cheating, versus 78.6% of men ¹¹

 

The Rise of Nonbinary Identity: Recent Data

Gender identity research has expanded significantly in recent years as more people identify outside the traditional binary.

How Many People Identify as Nonbinary?

• Among Gen Z adults, approximately 6.9% identify as nonbinary, according to U.S. Household Pulse Survey data ¹²

• Pew Research found 1.6% of all U.S. adults identify as transgender or nonbinary ¹³

• Among young adults under 30, about 5% identify their gender as different from their sex assigned at birth ¹³

• The Williams Institute estimates 1.2 million nonbinary adults in the U.S. among those aged 18-60 ¹⁴

• About 11% of LGBTQ adults identify as nonbinary ¹⁴

• Among nonbinary LGBTQ adults, 58% are cisgender and 42% are transgender ¹⁴

Youth and Identity

The shift is especially pronounced among younger generations:

• Among LGBTQ youth, 27% of those 18-24 and 26% of those 13-17 identify as nonbinary ¹⁵

• Most nonbinary youth use pronouns outside the gender binary, with 33% exclusively using they/them ¹⁵

• Among people born female between 2003-2006, 10.6% identify as nonbinary,nearly 1 in 9 ¹⁶

• Most nonbinary youth identify as multisexual: 28% bisexual, 27% pansexual, 22% queer, and 14% lesbian ¹⁵

• Research demonstrates that respecting nonbinary individuals' pronouns significantly reduces suicide risk ¹⁷

• About 20% of U.S. adults know someone who identifies as nonbinary, with higher rates among younger generations ¹³

 

How Often Are People Actually Having Sex?

The frequency question fascinates researchers and regular people alike. The data reveals some surprising trends.

Frequency by Age and Relationship

A 2017 study analyzing 25 years of data (1989-2014) established some baselines:

• Americans have sex an average of 54 times per year,roughly once per week ¹⁸

• 31% of couples have sex a few times per week, 28% a few times per month, and 8% once per month ¹⁸

• About 33% of couples either never have sex or rarely engage in sexual activity ¹⁸

• People aged 20-29 have sex more than 80 times per year on average, dropping to 60 times by age 45 and 20 times by age 65 ¹⁸

• Among adults 18-24, 37% of men and 52% of women have sex weekly or more ¹⁹

• In the 25-34 age bracket, 50% of men and 54% of women engage in sexual activity weekly or more ¹⁹

• Research consistently shows that happiness and relationship satisfaction peak at about once-weekly sexual frequency for couples ²⁰

• Having sex once per month or less is associated with higher mortality risk in men compared to those having sex four or more times monthly ²¹

The Decline in Sexual Frequency

Sexual activity has been trending downward across developed nations:

• Between 2000-2002 and 2016-2018, sexual inactivity among 18-24 year old men jumped from 18.9% to 30.9% ²²

• Sexual frequency has declined in developed countries, with the drop concentrated after 2000 ²²

• Americans born in the 1990s (Millennials and Gen Z) have sex about six times per year less often than those born in the 1930s ²²

• Couples who work full-time have sex more frequently than those working part-time or not employed ²³

• In Singapore, average sexual frequency rose from 0.68 to 0.78 times per week during the 2020 pandemic, though it remained below the desired level of 1.36 times weekly ²⁴

What This Data Actually Means

Sexual health statistics do something important: they remove shame and unrealistic expectations from the conversation. When you see that the median duration of intercourse is 5.4 minutes, or that one-third of couples rarely or never have sex, or that sexual desire varies enormously even among people with "normal" hormone levels, it becomes clear that there's no single template for sexual health.

The data also highlights areas of progress and concern. The three-year decline in STI rates is genuinely encouraging, suggesting that public health interventions and new prevention methods are working. The growing acceptance of diverse gender identities, reflected in the percentage of young people identifying as nonbinary, represents a cultural shift toward greater authenticity and self-expression.

At the same time, concerning trends persist. Congenital syphilis rates remain 700% higher than a decade ago. Sexual inactivity among young men has increased dramatically. The gap between desired and actual sexual frequency suggests many couples struggle with intimacy.

Perhaps most importantly, this research underscores that sexual health exists on a spectrum. What's "normal" for one person or couple may not be for another. Individual circumstances, health conditions, relationship dynamics, and personal preferences all play roles in what constitutes healthy sexual expression.

When concerns arise,about frequency, performance, desire, or physical symptoms,these statistics provide context, but they're not a substitute for professional guidance. Sexual health is complex, personal, and deserving of informed, stigma-free conversation grounded in evidence rather than assumptions.