A man was marooned on a Pacific desert island.  He survived for a year eating cocoanuts but his sexual appetite was relieved only by his own hand.  One day a ship sank offshore and a sheep that had been on the boat washed ashore.  Seeing his opportunity the man approached the sheep, who calmly walked away.  He ran toward the sheep and it just ran away from him.  He tried sneaking up on it the sheep heard him coming and ran away.  Later, a young woman who had been on the boat came ashore.  She was gorgeous and her clothes were badly torn and shredded and she was barely conscious.  The man brought her back to his camp and over several days he nursed her back to health.  Grateful, she offered to help him with his sexual frustrations.  "Great,' he said, "how are you at catching sheep?"