STD Risks: Unprotected Sex Between Monogamous Partners - Urology

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Use of condoms during intercourse?


If both partners are free of sexually transmitted infections (STIs) and engage in sexual intercourse without using condoms, there is no risk of transmitting STIs.
In such a scenario, if both individuals are in a monogamous relationship and have been tested for STIs, not using condoms may be considered safe.
However, it is important to note that the transmission of STIs typically requires at least one partner to be infected with the virus or bacteria responsible for the infection.

A-Wen, 20~29 year old female. Ask Date: 2014/02/09

Dr. Xu Weikai reply Urology


A-Wen: Hello, neither party has any sexually transmitted infections (STIs), so it is impossible to contract an STI.
Infection can only occur if there are pathogens present.
If there are any unclear points, feel free to ask again, and we can discuss and research further.
Answers found online should only be used as a reference; it is still necessary to seek medical attention at a healthcare facility.
This message is brought to you by Dr.
Hsu Wei-Kai, Director of the Urology Department at Taitung Hospital, Ministry of Health and Welfare.

Reply Date: 2014/02/09

More Info


When assessing the risks of sexually transmitted diseases (STDs) in the context of monogamous relationships, it is essential to understand the transmission dynamics of these infections. If both partners are confirmed to be free of STDs, the risk of transmission during unprotected sexual intercourse is significantly reduced. However, it is crucial to consider several factors that can influence this assessment.

Firstly, the primary mode of transmission for STDs is through direct contact with infected bodily fluids, such as semen, vaginal secretions, or blood. Therefore, for an infection to occur, at least one partner must be carrying the pathogen. If both partners have undergone testing and have received negative results for STDs, the likelihood of transmission during unprotected sex is minimal. However, it is important to note that testing should be comprehensive and include common STDs such as HIV, chlamydia, gonorrhea, syphilis, and hepatitis B and C.

Secondly, the timing of testing is critical. Many STDs have a window period, which is the time between potential exposure to the infection and when a test can accurately detect it. For example, HIV can take several weeks to months to become detectable. Therefore, if either partner has had potential exposure to an STD before the testing, it is advisable to wait for the appropriate window period before relying on the test results.

In a monogamous relationship where both partners are committed to each other and have been tested, engaging in unprotected sex may not pose a significant risk. However, it is essential to maintain open communication about sexual health and any potential exposures outside the relationship. If either partner has had sexual encounters with others, even if they were protected, it is prudent to retest for STDs before resuming unprotected sex.

Moreover, while the risk of transmission is low when both partners are confirmed to be STD-free, it is still advisable to practice safe sex, especially if there are any uncertainties regarding sexual history or if either partner has had new sexual partners. Using condoms not only reduces the risk of STDs but also provides protection against unintended pregnancies.

In summary, the risk of contracting STDs during unprotected sex between two monogamous partners who have both tested negative for infections is low, provided that the testing was thorough and conducted after the appropriate window period. However, maintaining safe sexual practices, including regular testing and open communication about sexual health, is essential for ongoing protection against STDs. It is always best to consult with a healthcare provider for personalized advice and to address any specific concerns regarding sexual health.

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