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Brown semen is a sign of old blood in the semen. Blood in the semen is a common benign finding in men and is due to either inflammation of the ejaculatory ducts, prostatitis or trauma to the prostate from long periods of sitting or bike riding. The bleeding can take 6-8 weeks to clear up and the more you ejaculate, the sooner it clears up. At a minimum, you should see a urologist to have your PSA checked and your prostate examined to screen for prostate cancer. Hope this helps and please let me know if you have questions.