Three main causes: As a man ages, the prostate can enlarge (bph). This can impede the fluid from coming out forcefully or in some cases, not at all. Ironically, treatments for BPH can also lead to failure of emission of semen. Some men, particularly those with diabetes, have a backward flow of semen into the bladder from nerve damage. More rarely, surgeries in the male abdomen/pelvis can result in no semen.
Answered 6/10/2014
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