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.
Yes, you can get an STI from oral sex, but the risk is lower than vaginal or anal sex for most infections. If you’re wondering exactly how likely transmission is, which type of oral sex is riskier, and what you can do to protect yourself, this guide breaks down the actual statistics and practical advice.
This isn’t about scare tactics. It’s about giving you honest information so you can make informed decisions about your sexual health.
Not sure? Get a discreet STI test with throat swab included
How Likely Is It to Get an STI from Oral Sex?
The overall risk depends on the specific STI, the type of oral sex, and whether either partner has symptoms or sores. Here’s how oral sex compares to other types of sexual contact:
| STI | Oral Sex Risk | Vaginal Sex Risk | Anal Sex Risk |
|---|---|---|---|
| Gonorrhoea | Moderate | High | High |
| Chlamydia | Low | High | High |
| Herpes (HSV) | Moderate-high | Moderate-high | Moderate-high |
| Syphilis | Moderate (if sore present) | High | High |
| HPV | Moderate | High | High |
| HIV | Very low | Moderate | High (receptive) |
For most bacterial STIs, the risk from oral sex is genuinely lower than from penetrative sex. But “lower risk” is not “no risk.” Gonorrhoea and herpes transmit relatively efficiently through oral contact.
The Real Statistics on Oral STI Transmission
Exact per-act transmission rates for oral sex are difficult to calculate because studies can’t easily isolate oral exposure from other sexual activities. However, research gives us useful estimates:
- Pharyngeal gonorrhoea is found in 5-10% of men who have sex with men attending sexual health clinics, and in around 2% of heterosexual women, according to BASHH surveillance data. Most of these infections are acquired through oral sex.
- Oral herpes (HSV-1) affects an estimated 67% of people under 50 globally (WHO), though most infections are acquired non-sexually in childhood. Genital herpes from receiving oral sex from someone with a cold sore is well documented.
- Oral HPV affects approximately 7% of the US population at any given time (CDC data). UK-specific prevalence data is limited but thought to be similar. Most infections clear within 1-2 years.
- HIV transmission through oral sex is estimated at 0-0.04% per act, according to a systematic review published in AIDS. This is dramatically lower than the 0.1-1.4% per-act risk from vaginal or anal sex.
The bottom line: you’re very unlikely to contract HIV from oral sex alone, but gonorrhoea, herpes, and HPV are realistic risks, particularly with multiple partners.
Which Type of Oral Sex Carries More Risk?
Giving oral sex (mouth to genitals)
This is the higher-risk activity for the person using their mouth. The throat is exposed to genital fluids (pre-ejaculate, ejaculate, vaginal fluid) and direct skin contact. Pharyngeal gonorrhoea and chlamydia are acquired almost exclusively through giving oral sex.
The risk increases if:
- You have cuts, sores, or bleeding gums in your mouth
- Your partner has visible sores (herpes, syphilis)
- Your partner ejaculates in your mouth
- You give oral sex to multiple partners
Receiving oral sex
The risk to the person receiving oral sex is generally lower. However, you can still acquire genital herpes (if your partner has oral herpes / cold sores), genital HPV, and potentially genital gonorrhoea or chlamydia from an infected throat.
Cold sores are the most common concern here. If your partner has an active cold sore and performs oral sex on you, HSV-1 can be transmitted to your genitals.
Mouth-to-anus contact (rimming)
Oral-anal contact carries additional risks beyond standard oral-genital contact:
- Hepatitis A — transmitted through the faecal-oral route
- Intestinal parasites — giardia, shigella
- Herpes and HPV — if present in the anal area
Hepatitis A vaccination is recommended for anyone who practises rimming. A dental dam provides effective barrier protection.
Factors That Increase Your Risk
- Multiple partners: More partners means more potential exposures. This is the single biggest risk factor
- Oral health: Bleeding gums, mouth ulcers, recent dental work, or piercings create entry points for infection
- Partner’s STI status: If your partner has an active, untreated STI, transmission risk is higher
- Visible sores or symptoms: Herpes blisters, syphilis chancres, or genital warts significantly increase the chance of transmission
- Ejaculation in the mouth: Increases exposure to HIV and bacterial STIs in semen
- Not using barrier protection: Condoms and dental dams substantially reduce risk
How to Make Oral Sex Safer
Complete safety would mean no oral sex at all, which isn’t realistic advice for most people. Instead, focus on risk reduction:
- Use condoms for oral sex on men — flavoured condoms exist for this specific purpose and significantly reduce transmission of all oral STIs
- Use dental dams for oral sex on women — a thin sheet of latex or polyurethane placed over the vulva or anus
- Avoid oral sex during outbreaks — if you or your partner has cold sores, herpes blisters, or any visible sores, wait until they’ve healed
- Maintain good oral hygiene — healthy gums and no open sores reduce entry points for infection
- Avoid brushing or flossing immediately before oral sex — this can cause micro-cuts in the gums
- Get vaccinated — HPV vaccine (if eligible) and hepatitis A vaccine (recommended for MSM and anyone practising rimming)
- Get tested regularly — especially request throat swabs if you give oral sex frequently
Should You Get Tested After Oral Sex?
If any of the following apply, yes:
- Your partner has told you they have an STI
- You have a sore throat, mouth sores, or unusual symptoms lasting more than 2 weeks
- You have multiple sexual partners
- You don’t use barrier protection for oral sex
- You haven’t been tested in the last year
When requesting a test, specifically ask for a throat swab in addition to the standard urine and blood tests. Throat gonorrhoea and chlamydia are only detected with a throat-specific test.
Order a comprehensive home STI test kit or find your nearest sexual health clinic.
Read more: Oral STI symptoms | Which STIs can you get from oral sex? | Testing options
Frequently Asked Questions
Is oral sex safe without a condom?
It’s lower risk than unprotected vaginal or anal sex, but not completely safe. The main risks are gonorrhoea, herpes, and HPV. If you don’t use condoms for oral sex, regular testing with throat swabs is the best way to protect yourself and your partners.
Can you get an STI from receiving oral sex from a woman?
Yes. If the person giving oral sex has an oral infection (herpes, gonorrhoea, chlamydia, or HPV in the throat), it can potentially be transmitted to your genitals. The most common scenario is acquiring genital herpes from a partner with oral cold sores.
Do most people use protection for oral sex?
No. Studies consistently show that condom and dental dam use for oral sex is very low compared to penetrative sex. This is one reason pharyngeal gonorrhoea rates are increasing. If you don’t use barriers, testing is your safety net.
My partner has oral herpes. Should I avoid receiving oral sex?
The risk of transmission is highest during active outbreaks (visible cold sores). Between outbreaks, the risk is lower but not zero due to asymptomatic viral shedding. Antiviral medication taken daily by your partner can reduce shedding and transmission risk. It’s a personal decision based on your comfort level with the risk.
Related reading
- A to Z of Sex: Sexual Health Terms Explained
- Alcohol and HIV: What You Need to Know
- Anxiety and HIV: Coping and Getting Support
- Are All STIs Curable?
- Blood Problems and HIV: Anaemia, Low Platelets and More
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.
