A fella goes into the doctors and says "I'm having problems with premature ejaculation every time me and the missus get down to it".
Doctor gives the guy a gun and say "When you feel like your going to cum to early then shoot this, it will startle you and allow you to carry on".
A week later the doctor sees this guy and says "How did my technique go?".
Guy replies "Fucking horrible, I was doing a 69er with my wife and felt like I was going to cum to early, so I shot the gun and my wife shat on my face, bit my dickhead off and the milkman came out the wardrobe with his hands up!"