Good news—evolution has taken care of this for you, to prevent the acid in urine from weakening your sperm. A clever valve system inside your urethra (the tube that carries both semen and urine out of your penis) allows only one of these processes to occur at a time. When you are close to ejaculating, the neck of the bladder is closed off so that urine can’t escape.
Women with this concern should see question 29.
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