 [ Symptoms ] as a man why do i have urine instead of semen for ejaculations [ Disease ] if you are past the age of puberty you should have this situation checked out by a urologist normally during sexual arousal the prostate gland fills with fluid this helps keep the neck of the urinary bladder tightly closed so that no urine leaks out during ejaculation in pubescent boys before all the internal male reproductive structures have matured it is not uncommon for urine leakage to occur with ejaculation after these structures have fully matured you should not have that problem if you do like i said you should see a urologist this is not an emergency situation but it is certainly something you should have checked you do not want to take chances with your reproductive health wishing you all the best