Guy goes to the doctor. "Hey, doc, I need something to stop me from cuming so quick."
The doctor replies, "Try this starting gun. Every time you feel you're about to let loose just fire the pistol into the air."
So the guy goes back to the doctors a week later. "Hey, doc, you know that starter pistol you prescribed me?"
"Yep, how'd you get on?"
"Not good," replies the bloke. "We were busy in the 69 position when I felt my balls start to tingle, so I fired off the pistol, the wife shat in my mouth, bit the end of my cock and the milkman came out of the wardrobe with his hands up."

That was good!