lager or guinness
bloke goes to the docs saying that he cant feel a thing when he is shagging the mrs. the doc says "what do you mean ?" he says "i 'm not touching the sides, and feel like i'm waving a pencil in the albert hall" the doc asks him what he drinks and he says" lager " the doc reeling away says,"thats the worst possible drink you could have it shrinks things". "have two weeks drinking guinness ,and then come back and see me" so off he goes and comes back two weeks later . the doc asks him how he got on with the guinness , he says"fuck the guinness i got the wife drinking lager. :D