Does body count matter when thinking about STIs?

It can, but not in the simple way people often assume. In a large British survey, Natsal-3, Chlamydia became more common as people’s number of partners in the past year went up, especially when they didn’t use condoms.

But 60% of Chlamydia in women, and 43% in men, was found in people who’d had only one partner in the past year. It only takes one partner with an infection, and many infections have no symptoms.

So your number doesn’t tell you, or anyone else, whether you have an STI. A test does.

Body count is slang for the number of people someone has had sex with. It often carries a judgement, with the suggestion that a high number is bad for women or good for men.

The phrase originally meant the number of people killed in a war. Its sexual meaning isn’t new: Merriam-Webster gives an example from 2004.

There’s no right or wrong number. In Natsal-3, carried out in Britain between 2010 and 2012, the typical (median) number of opposite-sex partners people aged 16 to 44 had had in their lifetime was 6 for men and 4 for women.

Results from the next survey, Natsal-4, are due at the end of November 2026.

Your risk depends more on what you do than on your total:

• Condoms: using a condom every time you have sex is the best way to protect you and your partners from HIV and other STIs.
• Recent partners: new partners and sex without condoms raise your risk. In Natsal-3, having two or more partners without using condoms in the past year was more strongly linked to Chlamydia than the number of partners in the past year alone.
• Testing: many STIs have no symptoms, so regular testing is the only way to find infections early.
• Vaccines and PrEP: the HPV vaccine protects against the types of HPV that cause most genital warts, and PrEP is a medicine that protects against HIV for people at higher risk.

Some STIs don’t need intercourse to spread. Herpes and genital warts spread through skin-to-skin contact.

Hepatitis B, Hepatitis C and HIV can also be passed on by sharing needles, and Hepatitis B and C by tattoos or piercings done with unsterilised equipment. In the UK, donated blood is tested for HIV and Hepatitis B, so the risk from a blood transfusion is very low. Read more in “7 ways you can catch an STI without having sex”

UK guidelines suggest:

• If you’re sexually active: test once a year, and when you change partner.
• If you’re starting a relationship with one long-term partner: test at the start.
• If you’ve had more than 10 partners in the past year, multiple or anonymous partners since your last test, or you take PrEP: test every 3 months.

Read more in “Which STI test do I need? How to choose the right test after a new partner”

You don’t need to know someone’s number to protect your sexual health. It’s more useful to talk about when you were each last tested, and whether you’ll use condoms. UK guidelines suggest testing at the start of a new relationship, so it’s a good time for you both to get tested.

Judging people by their number doesn’t help, either. The sexual health charity Brook says that fear of what others might think can stop people getting tested at all. Read more in “Should we get tested before having sex? How to talk to a new partner”

Better2Know offers:

• Full Screen: tests for 7 infections, including HIV, Syphilis, Chlamydia and Gonorrhoea, from 28 days after sex, with results in 3 days (5 days for the home test). You can book it at one of our clinics or order a Full Screen home test.
• Peace of Mind: tests for Chlamydia, Gonorrhoea and Syphilis from 14 days after sex, with results in 2 days.
• Platinum Screen: tests for 12 infections, including Herpes and Trichomonas, from 28 days after sex, with results in 3 days.

If you test before 45 days, a negative HIV result needs a repeat test. A Syphilis test in the first 3 months after sex can miss the infection, so you may need a repeat test. Not sure which test you need? Our Patient Care Team is available 24/7 on 020 7099 0955.

Does a high body count mean you have an STI?

No. More partners can raise your risk, especially without condoms, but only a test can tell you whether you have an STI. People with just one partner can have an infection too.

Can you get an STI from your first partner?

Yes. It only takes one partner with an infection. Read more in “Can virgins have STIs?”

Is there a safe number of partners?

No number is safe or unsafe on its own. Condoms protect you, and regular testing finds infections early, whatever your number.

Your body count says nothing about your worth, and not much about your sexual health either. What matters is how you protect yourself and how often you get tested. Test once a year and when you change partner, and more often if you have lots of partners.

Book a Full Screen at a clinic near you or order a home test kit from 28 days after sex. Our Patient Care Team is available 24/7 on 020 7099 0955.

Not in the UK? Choose your country from the selector at the top of the page for local tests and prices.

This article originally appeared on 10 May 2024 and was last updated on 1 October 2026.

This article is general information and not a substitute for personal medical advice.

Sources

1. Merriam-Webster, Body count: slang meaning, updated 19 August 2026. https://www.merriam-webster.com/slang/body-count
2. Merriam-Webster, Body count (dictionary entry), updated 18 September 2026. https://www.merriam-webster.com/dictionary/body%20count
3. Sonnenberg P, Clifton S, Beddows S, et al. Prevalence, risk factors, and uptake of interventions for sexually transmitted infections in Britain: findings from the National Surveys of Sexual Attitudes and Lifestyles (Natsal). The Lancet, 2013;382(9907):1795 to 1806. https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(13)61947-9/fulltext
4. Clifton S, Fuller E, Philo D. Natsal-3 reference tables. NatCen Social Research. https://www.natsal.ac.uk/natsal/wp-content/uploads/2023/03/Natsal-3-Reference-tables.pdf
5. Natsal, Natsal-4. https://www.natsal.ac.uk/researchers/natsal-4/
6. British Association for Sexual Health and HIV, Summary guidance on testing for sexually transmitted infections, 2023. https://www.bashh.org/_userfiles/pages/files/resources/bashh_summary_guidance_on_stis_testing_2023.pdf
7. NHS, Sexually transmitted infections (STIs), reviewed 13 May 2024. https://www.nhs.uk/conditions/sexually-transmitted-infections-stis/
8. NHS, Condoms, reviewed 26 January 2024. https://www.nhs.uk/contraception/methods-of-contraception/condoms/
9. NHS, HIV and AIDS, reviewed 9 July 2025. https://www.nhs.uk/conditions/hiv-and-aids/
10. NHS, Human papillomavirus (HPV), reviewed 10 March 2026. https://www.nhs.uk/conditions/human-papilloma-virus-hpv/
11. NHS, Genital herpes, reviewed 27 June 2023. https://www.nhs.uk/conditions/genital-herpes/
12. NHS, Genital warts, reviewed 10 July 2023. https://www.nhs.uk/conditions/genital-warts/
13. NHS, Hepatitis B, reviewed 17 November 2025. https://www.nhs.uk/conditions/hepatitis-b/
14. NHS, Hepatitis C, reviewed 19 March 2026. https://www.nhs.uk/conditions/hepatitis-c/
15. Brook, STIs and stigma, updated 8 August 2023. https://www.brook.org.uk/your-life/stis-and-stigma/
16. British HIV Association, British Association for Sexual Health and HIV and British Infection Association, Adult HIV testing guidelines, 2020. https://bhiva.org/wp-content/uploads/2024/10/HIV-testing-guidelines-2020.pdf
17. British Association for Sexual Health and HIV, UK guidelines for the management of syphilis, 2024. https://bashh.org/_userfiles/pages/files/syphilis_2024.pdf