An elderly widowed gentleman in a nursing home became very friendly with an elderly lady. He told her his former wife used to hold his penis every night to help him go to sleep.
The elderly lady decided to do this for her new male friend every night for a week. Each night he fell soundly asleep. The next week the gentleman told the lady that he was sorry but he had found a new partner. She was very upset and asked him, "What does she have that I don't have?"
He replied, "Parkinsons."