Was your age of first sex typical?
Every generation is sure the one after it started younger, and every generation is sure it was the last to wait. Two large surveys, one British and one American, asked people to put a number on it and sorted the answers by when they were born, and the pattern they found fits neither story. Enter the age you were, your sex, your birth decade and your country, and see how much of your cohort had started before you did. This calculator on Find The Norm uses Natsal-3 The Lancet data (N=15,162) and the CDC National Survey of Family Growth to rank your age of first sex against UK and US adults in your gender and birth-decade cohort.
Querying NSSHB / Natsal data…
How many lifetime partners is normal?
Your partner count against NSSHB and Natsal figures for your age and sex.
What is the average age of first sexual intercourse in the UK?
17 years old, for both men and women, according to Natsal-3, the National Survey of Sexual Attitudes and Lifestyles published in The Lancet in 2013 from 15,162 interviews, and the figure has barely moved across decades even though the share who started before 16 has swung about from one birth cohort to the next. Hold onto that distinction, because the median and the early-starter share are answering different questions, and the calculator uses the whole curve for your cohort rather than either number alone.
Among the 16 to 24 year olds Natsal-3 interviewed, 31% of men and 30% of women said they'd had sex before 16, a higher share than the older cohorts in the same survey reported, which reads as a drift toward earlier starts in the young, though more recent data suggests that drift has stalled or turned. Bear in mind who's answering. A 50-year-old is recalling something from decades back and a 17-year-old from last year, so the same question lands differently on the two groups, and the table below is built from the pooled answers.
| Age of first sex | Cumulative % of women (approx.) | Cumulative % of men (approx.) |
|---|---|---|
| By age 14 | 8% | 12% |
| By age 16 | 35% | 38% |
| By age 17 (median) | 55% | 56% |
| By age 18 | 68% | 68% |
| By age 20 | 85% | 84% |
| By age 25 | 97% | 97% |
What is the average age of losing virginity in the US?
About 17, which is the mean age of first sexual intercourse the CDC's National Survey of Family Growth (NSFG) reports for US adults, 17.3 for women and 17.0 for men in 2011 to 2015, and it lands almost on top of the British median of 17, so two countries that differ in schooling and in how much religion shapes daily life reach the milestone together. Watch the words, though. The US figure is a mean and the British one a median, and with a tail of late starters stretching an average upward, the two aren't quite the same kind of number.
American teenagers are also starting later than they did. In 2002 about 46% of never-married teenage boys said they'd had sexual intercourse, and by 2015 to 2019 that had fallen to 38.7%, while the figure for girls held steady at around 40% (Abma and Martinez, 2023). If you were born in the 2000s and picked the US, that's the cohort the calculator compares you with.
Has the average age changed over generations?
Yes, in both directions, because the share of British women reporting first sex before 16 rose a long way between the cohort born in the 1950s and the one born in the 1980s, and then the youngest cohorts Natsal surveyed showed signs of the trend levelling off or turning back. So the answer depends on which two generations you're comparing.
In the US the direction since 2002 has been clear, toward later or less frequent early sexual experience among teenagers, the pattern people call "the great teen sex decline", and it moves in step with falling sexual frequency among young adults. Social media eating into time spent in a room together is the usual first explanation, with heavier academic pressure and a changed attitude to risk behind it. The Rice Purity Score tracks the same milestones against same-age peers and shows the shift from the other end.
For the 1950s and 1960s cohorts, first sex often came later than today's median, in a world with far less access to contraception and a different legal and cultural frame around the whole subject. That's why the calculator asks for your birth decade rather than ranking everyone against one curve.
Is it normal to have sex late?
Yes, since survey after survey finds around 8 to 12% of adults in their early 20s haven't yet had sexual intercourse, and Lefkowitz et al. (2018) found 14.2% of first-year US college students had never had a first kiss with a romantic partner, so little or no experience in early adulthood is far more common than films and television let on.
The curve goes flat after 25. By then roughly 97% of adults have had first sex, which leaves 3% who haven't, and both they and the far larger group who started in their early or mid 20s sit inside the ordinary range. No doctor or psychologist has ever defined a correct age for it. If your result puts you out toward the late end, what it's telling you is that most of your cohort had started by then, and nothing more. The full CDC and Natsal data on age of first sex and other milestones is on the sex statistics page.
Frequently asked questions
17 for both men and women, per Natsal-3 in The Lancet 2013. The 16 to 24 year olds in that survey had a median of 16 and an interquartile range of 15 to 18, meaning half of that younger group had first sex somewhere between 15 and 18. Those two medians differ because they describe different groups, everyone surveyed in one case and the youngest slice in the other.
Completely. Around 8 to 12% of adults in their early 20s haven't yet had sexual intercourse, survey after survey, and the share runs higher where school or religion puts weight on waiting. Studies of US college students link late or no initiation with better grades and less risk-taking, and none of it carries any health meaning one way or the other.
Down, in the US. CDC data has the share of never-married teenage boys who've had sex falling from 45.7% in 2002 to 38.7% by 2015 to 2019, with girls steady at around 40%. That cuts against the assumption that each generation starts younger than the last. The Rice Purity Score catches the same shift, and wider data on age of first sex is on the sex statistics page.
NSFG key statistics report a mean rather than a median, 17.3 years for women and 17.0 for men aged 15 to 44 in 2011 to 2015, against 17.4 and 17.0 in 2002, so the typical age has barely moved. The NSFG draws a nationally representative probability sample of the non-institutionalised US population aged 15 to 49, which makes it the most careful source the country has for these estimates.
Roughly 3% on the cumulative figures this calculator uses, which have about 97% of adults having had first sex by 25. And the trend runs later. Jean Twenge et al. (2017, Archives of Sexual Behavior) worked through General Social Survey data and found 15% of 20 to 24 year olds born in the 1990s had had no sexual partner since turning 18, against 6% of those born in the 1960s.
Not as biology. Sexologists treat "virginity" as a social idea, and the hymen varies enormously between people and isn't reliably changed by first intercourse. The World Health Organization, UN Women and UN Human Rights said in a 2018 joint statement that no test can show whether a woman or girl has had intercourse. Surveys sidestep this by asking about age at first sexual intercourse, which is what this calculator ranks.
Only loosely, and cause is hard to pin down because the age you start is tangled up with everything else about your life. US survey data shows earlier starters going on to more lifetime partners (Haderxhanaj et al., 2014), and Sprecher et al. (1995) found women reported less pleasure and more guilt about their first time than men did. The Rice Purity Test sets age of debut alongside 99 other milestones.
Separately from opposite-sex intercourse, in both Natsal-3 and the NSFG. Natsal-3 found 5% of men and 6% of women aged 16 to 74 had had at least one same-sex partner in their lifetime. A first same-sex experience may not be someone's first sexual experience of any kind, and surveys define these firsts differently enough that comparing across them is hard.
Most of Western Europe and the United States cluster around a median first-intercourse age of 16 to 18, though the methods differ enough that fine comparisons are shaky. The Durex Global Sex Survey series and WHO-linked national studies find countries with secular, thorough sex education, the Netherlands and Scandinavia among them, don't start earlier than countries that teach abstinence, though they do use contraception more at first intercourse. Countries with strong conservative religious traditions, parts of the Middle East and sub-Saharan Africa outside the cities, report later medians, often above 20, with enough reporting bias in those settings that the figures want handling carefully.
- Mercer CH, Tanton C, Prah P et al. (2013). Changes in sexual attitudes and lifestyles in Britain through the life course and over time: findings from the National Surveys of Sexual Attitudes and Lifestyles (Natsal). The Lancet, 382(9907), 1781 to 1794
- Abma JC, Martinez GM. (2023). Teenagers in the United States: Sexual Activity, Contraceptive Use, and Childbearing, 2015 to 2019. National Health Statistics Reports No. 196. CDC/NCHS
- Lefkowitz ES, Wesche R, Leavitt CE. (2018). Never been kissed: correlates of lifetime kissing status in US college students. Archives of Sexual Behavior, 47(4), 1283 to 1293