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UTI (Urinary Tract Infection): common after unprotected anal

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After having anal sex with my girlfriend, in which I am and always have been her only partner, I began to secrete a puss-like yellowish discharge from my penis. This condition was also accompanied by painful urination. Can a infection occur from having unprotected anal sex? She has no symptoms of any kind. As a percaution we have both started taking a high dose of antibiotics as well as a medication for a urinary tract infections. Much to my surprise after 2 days I feel better with near to no puss left. We have been together for a LONG time I know that neither one of us has slept with anyone else and we've both had std check-ups annually which are always negative. We haven't ever had anything like this occur before. Like I stated earlier, this only occured after having unprotected anal sex is this common? Please help us.

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replied October 16th, 2006
Sexual Health - Men Answer A1623
According to the symptoms you describe (yellowish discharge from the penis, painful urination) and data about unprotected anal sex, it seems very likely that you have been experiencing a urethral infection (urethritis) probably caused by bacteria normally found in the rectum. The most common bacterium found in the rectum (and large intestines) is Escherichia Coli. This bacterium (most of its sero-types) normally lives in the bowels and doesn’t cause infection in the large intestines. If it reaches the urinary tract, however, Escherichia Coli usually causes a urinary tract infection (UTI). The urethra is the lower part of the urinary tract and Escherichia Coli can cause urethritis if it reaches the area in greater quantities (during anal sex). Urethritis caused by Escherichia coli is not considered a sexually transmitted disease but it can be transmitted via unprotected anal sex. You can use condom to avoid this type of infection.
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