Oral Sex and STD Transmission: Syphilis Risks - Urology

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Both unprotected oral sex and protected oral sex can transmit sexually transmitted infections (STIs). While using a condom can significantly reduce the risk of transmission, it does not eliminate it completely. Certain STIs, such as herpes, syphilis, and human papillomavirus (HPV), can still


Syphilis can be transmitted through direct contact with a syphilis sore, which can occur in the genital area, anus, or mouth.
If either partner has an open sore, there is a risk of transmission.
However, if both partners do not have any sores and maintain good hygiene, the risk of transmission is significantly reduced, but not entirely eliminated.
Kissing can potentially transmit syphilis if one partner has oral sores.
Therefore, it is important to be aware of any sores or symptoms and to practice safe sexual behaviors.

Yang Yang, 10~19 year old female. Ask Date: 2019/04/04

Dr. Du Shixi reply Urology


Hello: Engaging in unprotected oral sex carries certain risks; using protection throughout can help avoid these risks.
Kissing can transmit syphilis—wherever there is bodily fluid, there is a chance, although the risk is lower.
Sexual activity remains the primary concern.

Reply Date: 2019/04/04

More Info


When it comes to understanding the risks of sexually transmitted diseases (STDs) such as syphilis in the context of oral sex, it is essential to consider several factors, including the presence of sores or cuts, the health status of both partners, and the nature of the sexual activities involved.

Syphilis is primarily transmitted through direct contact with syphilis sores, which can occur on the genitals, anus, or mouth. If one partner has an active syphilis sore, engaging in oral sex can pose a risk of transmission, especially if the receiving partner has any cuts or abrasions in their mouth. This is because the bacteria that cause syphilis, Treponema pallidum, can enter the bloodstream through these openings. Therefore, if either partner has a sore, the risk of transmission increases significantly.

However, if both partners are free of sores and are in good health, the risk of transmitting syphilis through oral sex is considerably lower. It is important to note that syphilis can still be transmitted even if there are no visible symptoms, as the infection can be present in the body without any outward signs. This is why regular testing and open communication about sexual health with partners are crucial.

Regarding kissing, syphilis can also be transmitted through deep kissing if one partner has sores in or around the mouth. While the risk is lower compared to direct genital contact, it is still a possibility. Therefore, if you are aware that a partner has syphilis or any other STD, it is advisable to avoid intimate contact, including kissing.

In terms of hygiene, washing before sexual activities can help reduce the risk of infections, but it does not eliminate the risk of STDs. Bacteria and viruses can still be present on the skin or mucous membranes, and washing does not remove them entirely. Therefore, relying solely on hygiene practices is not sufficient for preventing STD transmission.

To summarize, the risk of contracting syphilis through oral sex depends on several factors:
1. Presence of Sores: If either partner has syphilis sores, the risk of transmission is high.

2. Health Status: Both partners should be aware of their sexual health status and get tested regularly.

3. Type of Contact: Engaging in deep kissing or oral sex with an infected partner increases the risk.

4. Hygiene Practices: While good hygiene is important, it does not guarantee protection against STDs.

If you suspect you may have been exposed to syphilis or any other STD, it is crucial to seek medical advice and get tested. Early detection and treatment are vital for managing STDs effectively and preventing further transmission. Regular check-ups and open discussions about sexual health with partners can significantly reduce the risk of STDs, including syphilis.

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