A middle-aged married couple were members of a party that went snorkelling off Hawaii. After spending an hour in the water, everyone got back on the boat except for the wife and a handsome young man. As she continued to explore underwater, she noticed that wherever she swam, he did, too. She continued snorkelling for another forty minutes, and so did he. She felt really flattered by his attention, and as she took off her fins, she coyly asked him why he had remained in the water for so long. "I …