References UK clinical guidance from the NHS, the British HIV Association (BHIVA), and the British Association for Sexual Health and HIV (BASHH). Last updated: April 2026.
Condoms are one of the most effective ways to reduce STI risk, but they don’t provide 100% protection against every infection. STIs that spread through skin-to-skin contact rather than bodily fluids can be transmitted through areas the condom doesn’t cover.
This doesn’t mean condoms aren’t worth using. They dramatically reduce the risk of HIV, chlamydia, and gonorrhoea. But knowing what they don’t fully protect against helps you make informed decisions about testing.
Using condoms? Still worth getting tested regularly
What Condoms Protect Against (Very Effectively)
| STI | Condom Effectiveness | Transmission Route |
|---|---|---|
| HIV | Very high (90-95% reduction) | Bodily fluids |
| Chlamydia | High (significantly reduced) | Genital fluids |
| Gonorrhoea | High (significantly reduced) | Genital fluids |
| Trichomoniasis | High | Genital fluids |
| Hepatitis B | High | Bodily fluids |
What Condoms Don’t Fully Protect Against
| STI | Why Condoms Are Limited | Risk Reduction |
|---|---|---|
| Herpes (HSV) | Spreads through skin contact beyond condom area | ~30-50% reduction |
| HPV (genital warts) | Spreads through genital skin contact | ~30-60% reduction |
| Syphilis | Chancre can be on skin not covered by condom | Moderate reduction |
| Pubic lice | Live in pubic hair, not affected by condoms | No protection |
| Scabies | Spread by skin-to-skin contact anywhere | No protection |
| Molluscum contagiosum | Spread by skin contact | Limited |
Why You Should Still Use Condoms
The fact that condoms aren’t perfect doesn’t mean they’re pointless. They reduce the risk of nearly every STI to some degree, and they’re highly effective against the most serious ones (HIV, chlamydia, gonorrhoea). Using condoms consistently is one of the best things you can do for your sexual health.
For the STIs that condoms don’t fully prevent, regular testing is your safety net. If you use condoms consistently but have multiple partners, annual STI screening is still recommended.
Other protective measures:
- HPV vaccine: Protects against the highest-risk HPV strains
- PrEP: Daily medication that prevents HIV (available free on NHS)
- Dental dams: For oral sex protection
- Regular testing: Catches what condoms miss
Read more: Do condoms prevent STIs? | What is PrEP? | Testing options
Frequently Asked Questions
Can you get chlamydia while using a condom?
It’s very unlikely if the condom is used correctly and doesn’t break. Condoms are highly effective against chlamydia, which is transmitted through genital fluids. Incorrect use (putting it on late, using the wrong size) reduces protection.
Should I get tested if I always use condoms?
If you have multiple partners, yes. Condoms don’t fully protect against herpes, HPV, and syphilis. Annual testing gives you a complete picture of your sexual health status.
Related reading
- Can You Catch an STI From a Toilet Seat?
- Can You Get Chlamydia From Kissing?
- Can You Get Herpes From a Toilet Seat?
- Can You Get Herpes From Kissing?
- Can You Catch Syphilis Without Having Sex?
Sources
- NHS — Sexual health conditions
- BASHH — UK clinical guidelines for STI management
- British HIV Association (BHIVA) — HIV treatment guidelines
- Terrence Higgins Trust — sexual health information
- UK Health Security Agency — STI surveillance data
Steve Page is a recognised expert on Sexually Transmitted Diseases (STDs) and STD treatments, having published numerous articles in peer-reviewed journals and presented his research at conferences around the world. He has an in-depth understanding of the latest medical research on STDs, and is an advocate for the development of new treatments and protocols to improve the health of those affected. In addition to his research, he has dedicated his career to understanding the causes and symptoms of STDs, as well as how to best treat those impacted.
