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Anejaculation is the absence of ejaculation and is associated with various male sexual dysfunction disorders. Anejaculation may be attributed to psychologic or physiologic origins, or a combination. It is often associated with medications or nerve damage occurring from trauma, surgery, or illnesses such as diabetes, multiple sclerosis or disorders affecting the male genitourinary tract. Since erection and ejaculation are different physiologic processes, many men with anejaculation are still able to have erections but may have to rely on medications or external stimulation therapies to achieve ejaculation. In cases where this fails, sometimes surgical removal of sperm is required if the affected male desires to have children.
A relatively uncommon disorder, anejaculation — or the absence of any semen — can occur as a result of spinal cord injury, previous surgery, diabetes, or multiple sclerosis. It may also be caused by abnormalities present at birth as well as other mental, emotional or unknown problems. Medical therapy with drugs is usually the first line of treatment, but if that fails, the next step is either rectal probe electroejaculation (RPE) or penile vibratory stimulation (PVS).