A 90-year-old man went to see his doctor. The doctor asked him what the problem was. The man replied, "Well, doctor, it's my sex drive." The doctor looked at the man, who was in poor health, could hardly walk and was missing a few teeth, and asked, "What about your sex drive?" The man responded, "I want you to lower it." The confused doctor gave the man a quick exam. Afterward, the doctor was still puzzled about the man's problem. "I'm sorry," the doctor told him, "but I see nothing so extraordinary about your sex drive. It's all in your head." "I know," the man responded. "That's why I want you to lower it!"