STD Risks in Threesomes: What You Need to Know - Urology

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Sexually transmitted diseases (STDs) issues?


Hello doctor: If I engage in sexual activity with three people, two men and one woman, and we all cleaned ourselves beforehand, used condoms, did not perform oral sex, and changed condoms during the process for hygiene reasons, with the woman confirmed to be safe, but I'm still a bit worried about the male friend, I would like to ask if there is a risk of contracting HIV in this situation?

Louis, 20~29 year old female. Ask Date: 2011/11/30

Dr. Lin Hexing reply Urology


Hello, sir: I would like to respond to your question and provide the following advice: Your sexual relationships are quite complex, especially regarding male-to-male interactions, which carry a higher risk.
While safety measures are in place, it is still advisable to avoid such activities.
Wishing you safety and happiness.

Reply Date: 2011/11/30

More Info


When engaging in sexual activities, particularly in a threesome scenario involving two men and one woman, it is essential to understand the risks associated with sexually transmitted diseases (STDs), including HIV. While you mentioned that all parties involved were clean and used condoms throughout the encounter, there are still several factors to consider regarding STD transmission.

1. Condom Effectiveness: Condoms are highly effective at reducing the risk of STD transmission, including HIV, when used correctly and consistently. However, they are not 100% foolproof. If the condom breaks or slips off during intercourse, the risk of transmission increases. It’s crucial to ensure that condoms are properly fitted and checked for any damage before use.

2. Multiple Partners: Engaging in sexual activities with multiple partners can increase the risk of exposure to STDs, even if precautions are taken. This is because the more partners involved, the higher the likelihood that one of them may carry an infection, even if they are asymptomatic. It’s important to know the sexual health status of all partners involved.

3. HIV Transmission: HIV is primarily transmitted through bodily fluids, including blood, semen, vaginal fluids, and breast milk. If one of the male partners is HIV positive and not on effective treatment, there is a risk of transmission, even if condoms are used. The risk is significantly lower if the HIV-positive partner is on antiretroviral therapy (ART) and has an undetectable viral load, as this effectively eliminates the risk of sexual transmission (often referred to as U=U, or undetectable equals untransmittable).

4. Testing and Communication: It is advisable to have open and honest discussions with all partners about their sexual health history and to get tested for STDs before engaging in sexual activities. Regular testing is crucial, especially when engaging in sexual activities with multiple partners. If you have concerns about potential exposure to HIV or other STDs, consider getting tested after the encounter, typically around 2-4 weeks for initial HIV testing, and follow-up tests at 3 months for conclusive results.

5. Post-Exposure Prophylaxis (PEP): If you are concerned about potential exposure to HIV, there is a medication called post-exposure prophylaxis (PEP) that can be taken within 72 hours after potential exposure to reduce the risk of infection. It is important to seek medical advice as soon as possible if you believe you may have been exposed.

6. Other STDs: Besides HIV, other STDs such as gonorrhea, chlamydia, syphilis, and herpes can also be transmitted through sexual contact. Even with condom use, some STDs can be transmitted through skin-to-skin contact. Regular screening for STDs is recommended, especially after new sexual encounters.

In summary, while using condoms significantly reduces the risk of STD transmission, it does not eliminate it entirely. Open communication with partners, regular testing, and understanding the risks involved are essential steps in maintaining sexual health. If you have any specific concerns or symptoms, it is advisable to consult a healthcare professional for personalized advice and testing.

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