Having a baby

A man goes to a surgeon and convinces him that he wants to have the experience of having a baby.
 "Impossible," says the surgeon.
"But I need that experience," insists the man.
Eventually the surgeon agrees, and tells the man to come back next day for the operation.
Next day he is put out and operated on. When he comes around he asks the surgeon if the operation was successful.
"Yes, perfect."
"When will I have the experience of having a baby?" asks the man.
"Just as soon as you have drunk this pint of olive oil," says the surgeon.
"How's that going to give me the experience?"
"Because I have sewn up your ass."