Two deaf people get married and find out on their wedding night that they cannot communicate with the lights off, not being able to sign language or read lips.
"Honey," the woman signed to her new husband, "why don't we agree on some simple signals? For instance if you want to have sex with me, reach over and squeeze my left breast once. If you don't want to have sex then reach over and squeeze my right breast once."
The husband thinks about it for a moment then says, "Okay, but if you want to have sex with me, reach over and pull on my penis once, but if you don't want to have sex with me reach over and pull on my penis 250 times!"