An old man and a old woman met at an retirement home. They had been dating for quite some time now and one day the old man asks, "If I pull out my penis, would you hold it?" The women agrees and so everyday they would sit on a bench in the garden and the woman would hold the man's penis. One day the woman went to the garden early and found the man with another woman. She approached the man and asked what the other woman has that she doesn't.
The man replied gleefully "Parkinsons!"