A nervous young woman wearing only a thong bikini took a stool at the bar in a beachfront club. She glanced left, right, and over each shoulder, looking anxious. The bartender approached her, and she ordered a margarita. "I need to see some ID," the bartender said. "That's what I was worried about," she told him. "I don't have any one me--no place to keep it." "I can't serve you, then," the barteneder replied. The young woman sighed. "Oh, all right." She took a card from inside one of the cups of her bikini top, sliding it across the bar. The bartender took a look at it and smiled. "One margarita coming right up!" he said. An older woman, who'd witnessed the scene, said, "If you don't mind my asking, why didn't you just give it to him the first time he asked?" The young woman replied, "I don't like to give out my phone number unless I have to."