A man enters the hospital for a circumcision. When he comes to after the procedure, he's perturbed to see several doctors standing around his bed.
"Son, there's been a bit of a mix-up," admits the surgeon. "I'm afraid there was an accident, and we were forced to perform a sex-change operation. You now have a vagina instead of a penis."
"What!" gasps the patient. "You mean I'll never experience another erection?"
"Oh, you might," the surgeon reassures him. "Just not yours."