Two deaf people get married. During the first week of marriage, they find
     that they are unable to communicate in the bedroom when they turn off the
     lights because they can't see each other using sign language. After
     several nights of fumbling around and various misunderstandings, the wife
     decides to find a solution.
     "Honey," she signs, "Why don't we agree on some simple signals?  For
     instance, at night, if you want to have sex with me, reach over and squeeze
     my left breast one time.  If you don't want to have sex, reach over and
     squeeze my right breast one time."
     The husband thinks this is a great idea and signs back to his wife, "Great
     idea, Now if you want to have sex with ME, reach over and pull on my penis
     one time."  If you don't want to have sex, reach over and pull on my penis
     fifty times"