4. Cast Away: Wilson

6. The urge to have sex is so powerful that it can drain psychic energy away from other necessary goals. Therefore every culture has to invest great efforts in rechanneling and restraining it, and many complex social institutions exist only in order to regulate this urge. The saying that "love makes the world go round" is a polite reference to the fact that most of our deeds are impelled, either directly or indirectly, by sexual needs.—Mihaly Csikszentmihalyi, Flow: The Psychology of Optimal Experience