The trailer park gal went to the doctor complaining about pain in all her joints. The doctor went through a whole series of tests and couldn't find anything wrong. After he had explained this to her, he said "There has to be something else. Have you recently changed anything in your lifestyle"? She said, "Well the only thing I know of is that I started making love doggie style. Could that be causing it?" The doctor said, "Maybe, why don't you stop it and see if you improve"? The gal replied, " That might be a problem. I don't think the dog knows any other position".