A guy goes to his doctor and says: "Doctor, my wife and I have a real problem. After twenty years of marriage, I'm suffering from impotency. It's affecting our life and happiness and I don't know what to do."
The doctor says: "I think the problem is lack of exercise. I suggest that you start walking 7 miles a day and come back and see me in a week."
A week later the man goes to the doctor and the doctor asks: "Well how are things with your wife at home?"
The man replies: "How should I know, I'm 49 miles away."
