It even happens in the brain dead, as linked above. Artificially stimulated ejaculation in the brain dead patient: a case report.
Townsend MF 3rd1, Richard JR, Witt MA.
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Abstract
Cutaneous vibratory stimulation and rectal probe electroejaculation are highly successful methods of obtaining semen in the anejaculate patient. We report a case in which spermatozoa were retrieved in a brain dead man by artificially stimulated ejaculation. The specimen was cryopreserved to be used at a later date in combination with assisted reproductive techniques.