Blood in semen
http://www.goaskalice.columbia.edu/1022.html
Dear Alice,
My wife and I had sex the other day, and when I ejaculated, my semen had blood in it. I have no blood in my urine. What could be wrong?
Dear Reader,
Blood in the semen is known as hematospermia. This condition is actually fairly common, and in younger men, it's very rarely a sign of a serious problem. Hematospermia has many potential causes, the most common of which is inflammation of the seminal vesicles (the small glands that produce most of the fluid in semen). Other possible explanations may include inflammation or lesions in other parts of the reproductive system (e.g., the prostate, urethra, testicles, and epididymis), trauma to the genitals, or certain infections.