A bloke goes to the doctors complaining that he can't get any feeling when he is shagging his wife. The doctor asks if he drinks and the bloke answers yes. The doctor then asks what he drinks and the bloke replies larger why?. The doctor tells him thats where his problem lies because larger shrinks things, and says that the bloke should try Guiness instead because of the iron content. The bloke agrees and says he will be back in two weeks for a progress report. Two weeks pass and the bloke returns, The doctor asks him how it's going and the bloke says absolutley amazing your a genius doc. The doctor says thats great so the guiness working then. The bloke says no i got the wife on larger.