Risk of HIV Transmission Through Oral Sex: What You Need to Know - Urology

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The probability of contracting an infection through oral sex?


Hello, doctor.
Today, I had oral sex with a stranger, and it was unprotected oral sex without ejaculation inside.
However, the other person mentioned that their mouth had a small cut, but they were unsure if there was any bleeding.
Is there a chance of contracting HIV from this? Additionally, during vaginal intercourse, I used a condom, but after ejaculation, I continued to thrust and I'm not sure if the condom broke.
When I pulled out, the condom was still on, and I didn't see any semen, so could it have broken? I had already ejaculated once before, but the amount afterward might not have been as much.
Is there a risk of HIV infection?

Guan, 10~19 year old female. Ask Date: 2019/12/29

Dr. Du Shixi reply Urology


Hello: The premise is that if the partner has a sexually transmitted infection (STI), there is a potential risk, which can be classified as moderate risk.
The following can be referenced:
● No-risk sexual activities (non-harmful affectionate behaviors): These include light kissing, masturbation, hugging, massage, mutual caressing, and touching areas other than the genitals.

● Low-risk sexual activities: These include mutual masturbation, mutual rubbing, deep kissing, bondage, protected deep foreplay, oral sex with condoms or dental dams, anal intercourse, and vaginal intercourse.

● Moderate-risk sexual activities: These include withdrawal (pulling out), sharing sex toys, unprotected deep foreplay, oral sex before ejaculation, and oral sex during menstruation.

● High-risk sexual activities: These include unprotected anal intercourse, unprotected vaginal intercourse, oral sex during menstruation, retaining semen in the mouth, sharing needles, syringes, and bleeding during sexual activity.

Reply Date: 2019/12/29

More Info


The risk of HIV transmission through oral sex is a topic that raises many questions and concerns, especially when engaging in sexual activities with new or unfamiliar partners. In your situation, several factors need to be considered to assess the risk of HIV transmission.

Firstly, it's important to understand that oral sex is generally considered to be a lower-risk activity for HIV transmission compared to anal or vaginal sex. However, the risk is not zero, especially in certain circumstances. The presence of cuts or sores in the mouth can increase the risk of transmission, as these can serve as entry points for the virus. If the woman you engaged with had a sore in her mouth, even if it was minor, there is a potential risk if her saliva came into contact with your mucous membranes.

In your case, since you mentioned that the woman had a "bit of broken skin" in her mouth, this could potentially elevate the risk of HIV transmission during oral sex. Additionally, if you had any cuts or abrasions in your mouth, this could further increase the risk. The likelihood of transmission also depends on whether the woman is HIV-positive and her viral load, which is the amount of HIV in her blood. If she is undetectable (meaning her viral load is so low that it cannot be transmitted), the risk is significantly reduced.

Regarding the vaginal intercourse you described, using a condom greatly reduces the risk of HIV transmission. However, if the condom broke during intercourse, there is a risk of exposure to HIV if the woman is HIV-positive. If you did not see any semen in the condom after withdrawal, it may indicate that the condom did not break, but it is crucial to check for any visible damage to the condom itself. If there was any doubt about the integrity of the condom, it is advisable to consider the possibility of exposure.

In terms of testing for HIV, the window period—the time it takes for the body to produce detectable antibodies after infection—can vary. Most modern tests can detect HIV within 10 to 14 days after exposure, but it is generally recommended to wait at least 4 to 6 weeks for a more reliable result. For definitive results, testing at 3 months post-exposure is advised, as this is when the majority of infections can be detected.

If you are experiencing any symptoms that concern you, such as fever, fatigue, or unusual rashes, it is essential to consult a healthcare professional. These symptoms can be indicative of various conditions, and only a medical professional can provide an accurate diagnosis and appropriate testing.

In summary, while the risk of HIV transmission through oral sex is lower than through other forms of sexual activity, it is not negligible, especially if there are open sores or if the partner's HIV status is unknown. Using condoms consistently and correctly during vaginal intercourse is crucial in reducing the risk of HIV and other sexually transmitted infections (STIs). If you have concerns about potential exposure, seeking medical advice and getting tested is the best course of action. Remember, open communication with sexual partners about health status and safe practices is vital in protecting yourself and others.

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