A UTI can dramatically increase the sensitivity of the urethra due to ongoing irritation and inflammation. During intercourse, areas around the urethra experience frequent rubbing, resulting in pain when the urethra is inflamed.
For females, the pain may be even more intense, as pressure on the internal walls of the vagina may push on the bladder. Additionally, engaging in intercourse with a UTI can introduce more bacteria into the urethra, worsening the infection and intensifying the pain.

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