Retrograde ejaculation - Definition

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Retrograde ejaculation refers to an ejaculation that does not go outwards but inwards, toward the inside of the body, in the direction of the bladder. The ejaculate is composed of sperm and is produced by the contraction of the seminal vesicles. Semen is normally expelled toward the outside through the urethral meatus. The presence of blood in the sperm is evidence of retrograde ejaculation. It is due to a weak bladder sphincter that allows the sperm to pass. It can be caused by surgery on the prostate, the sphincter of the bladder, diabetes, or certain medications.