A fellow had been stranded on an island since he was a young boy.
One day a girl washed up on the beach. They got to talking, and
she asked, "How have you managed to survive?". He said, "Oh, I
pick coconuts, I fish, I dig for clams". She said, "What do you
do for sex?". He replied, "What's that?". She said, "I'll show
you", and so she did. Afterwards, he sat down and began to cry.
She asked, "What's the matter? Didn't you like it?". He said,
"(sob) (sob) You ruined my clam digger!".