Key points at a glance
👍 negligible
According to current knowledge, HIV transmission through oral sex (blowing or licking) is very rare
🍆 Reducing the risk of STIs during oral sex
Condoms for blow jobs and dental dams for licking reduce the risk of STIs
🧪 Testing provides security:
Anyone who has frequently changing sexual partners or is unsure after a risk can be tested for STIs.
🧑⚕️ Warning: STIs:
Other sexually transmitted infections (STIs) such as gonorrhoea, chlamydia or syphilis are transmitted much more frequently during oral sex than HIV.
HIV through oral sex - is that even possible?
In short: Yes, HIV can be transmitted through oral sex - but it happens very rarely.
Compared to anal or vaginal sex, the risk is significantly lower, especially if there is no semen or blood in the mouth.
Blowjob (penis in mouth)
The overall risk of HIV is higher when blowing Very low.
Important points:
- As long as no sperm in the mouth bubbles are considered one of the Lowest risk practices in relation to HIV.
- Pleasure drops (pre-ejaculate) normally contain too little virus to pose a relevant risk.
- There is a very low residual risk if
- semen gets into the mouth or throat, especially if it swallowed becomes,
- the Oral mucosa irritated or injured (e.g. small wounds, aphthae, bleeding gums).
Licking the vulva (cunnilingus)
For gay, bi+ and trans men, oral sex on the vulva can also play a role:
- At the Licking the vulva is the HIV risk even lower than when blowing.
- It becomes more critical when
- Menstrual blood is in play,
- you Open spots in the mouth have.
Without blood contact, HIV transmission during cunnilingus is extremely unlikely.
Safer sex during oral sex
Even though the risk of HIV during oral sex is comparatively low, you can reduce it even further
- At the Licking a vulva you can use a Condom cloth/dental dam use.
- It is best to use Water- or silicone-based lubricant. This makes everything more pleasant and is gentle on the mucous membranes.
- The following applies to latex: No oil (e.g. oil lotions or Vaseline) because it can make the material porous.
DIY tip:
You can easily make a condom cloth from a condom: Cut off the tip and cut the condom open lengthways - your dental dam is ready.
Protect your mouth & teeth
To avoid minor injuries:
- Better before oral sex not directly before brush your teeth vigorously or use dental floss.
- If you Aphthae, cracks or bleeding gums a break from oral sex with semen/blood in your mouth is a good idea.
- After oral sex, it is enough to clean your mouth with Rinsing out water. Scrubbing too vigorously afterwards can further irritate the mucous membrane.
Communication & Consent
- Discuss beforehand whether Semen in the mouth is okay for you or not.
- Ask your partner to Announce orgasm, so that you can decide for yourself whether you want to stay in the mouth or leave in time.
- Be clear if you feel insecure - your boundaries are just as important as his desire.
What to do after a risk situation?
You should take a break if ...
- you severe inflammation or have open sores in your mouth,
- you have just Dental treatment behind you,
- with you or your partner Blood is involved (e.g. menstruation, bleeding gums),
- the suspicion of a STI (e.g. sore throat, purulent discharge, mouth ulcers).
In these cases, it is advisable to avoid oral sex with semen or blood in the mouth until everything has been clarified.
After a possible risk situation
Have you had oral sex and are worried afterwards?
- Keep calm. HIV transmission through oral sex is very rare.
- Assess the risk:
- Came Cum or blood in your mouth?
- Do you have it swallowed?
- Is your partner's HIV status known?
- Get medical advice quickly, if you think there might have been a relevant risk after all - e.g. via
- HIV focus practice
Sexually transmitted diseases through oral sex
While HIV is rarely transmitted during oral sex, the situation is different for other infections:
- Gonorrhoea
- Chlamydia
- Syphilis
- Herpes
- HPV (genital warts)
These pathogens can Very easily via mouth, throat, penis and vulva even without visible symptoms. Therefore:
- Regular STI checks are particularly useful for gay, bi+ and trans men with changing partners.
- Condoms and dental dams not only reduce the risk of HIV, but also protect against many of these infections.
| Case | Situation | HIV risk & assessment |
|---|---|---|
| Case 1: Bubbles without sperm in the mouth | You give your partner a blowjob, but he doesn't come in your mouth. | The HIV risk is Very low. Even if you are worried about it afterwards: from an HIV perspective, this is generally No reason to panic. |
| Case 2: Semen in your mouth, you spit it out | Your partner comes in your mouth, you spit out the sperm directly and rinse with water. | The risk is slightly increased, but still significantly lower than with unprotected anal sex. If your partner is HIV-positive and not successfully treated, you should discuss with an HIV specialist practice or accident and emergency department whether a PEP (emergency treatment after risk) makes sense. |
| Case 3: Sperm swallowed by a known HIV-positive partner | You swallow sperm and later find out that your partner is HIV-positive. |
If he is under effective therapy and his viral load
not detectable (U=U), the risk is considered practically zero. If his status is unclear or he is not undergoing treatment, the risk is higher. low, but available |
| Case 4: Licking the vulva without menstrual blood | You are performing oral sex on a vulva, there is no blood involved. | According to current knowledge, HIV transmission is Extremely unlikely. |
| Case 5: Dental treatment & oral sex immediately afterwards | You have just been to the dentist and had, for example, a dental cleaning or treatment with possible gum bleeding. | In the first few hours afterwards, the mucous membrane is often Irritated or injured – During this time, you should refrain from oral sex involving semen or blood in the mouth in order to minimise the risk. |
Frequently asked questions about HIV transmission through oral sex and fellatio
Can you catch HIV from a blowjob? Is semen in your mouth dangerous, and how high is the risk of HIV from oral sex really? Here you’ll find answers to the most important questions about HIV, blowjobs and safer sex.
Can you catch HIV through oral sex?
HIV transmission through oral sex is theoretically possible, but in practice it is extremely rare. The risk is particularly low during fellatio if no semen or blood enters the mouth. Even if semen is swallowed, HIV transmission is extremely unlikely. Unlike unprotected anal sex, oral sex therefore plays virtually no role in HIV transmission. Important to note: other sexually transmitted infections can be transmitted much more easily through oral sex.
How high is the risk of HIV transmission during oral sex?
The risk of HIV transmission during oral sex is extremely low and significantly lower than during unprotected anal sex. For the person performing oral sex, infection is extremely unlikely, even if semen enters the mouth. The person receiving oral sex is not at risk of HIV through this practice. Even during oral sex without ejaculation, there is virtually no risk of HIV transmission. If an HIV-positive person is receiving effective treatment and their viral load remains consistently below the detection limit, sexual transmission of HIV is impossible. This also applies to oral sex.
Does receiving oral sex pose a risk of HIV infection?
No, the person receiving oral sex is not at risk of contracting HIV from the act itself. HIV is not transmitted through saliva, and contact between the penis and another person’s mouth does not constitute a relevant route of transmission. Even if the person giving the blowjob is HIV-positive, there is no risk of infection from the act itself. However, other sexually transmitted infections such as gonorrhoea, syphilis or herpes can be transmitted during receptive oral sex.
What should you do if semen gets into your mouth during oral sex?
If semen gets into your mouth whilst giving a blow job, or if you swallow it, you generally don’t need to worry about HIV. Transmission is extremely unlikely, even in such cases. You can spit the semen out or swallow it. There is no need to rinse your mouth vigorously or brush your teeth straight away. HIV post-exposure prophylaxis (PEP) is generally not recommended following ordinary oral sex involving semen. If you’ve also had another high-risk exposure to HIV or are unsure, you can seek advice from an AIDS charity or a specialist medical centre.
