Vernacchio explained that sex as baseball implies that it’s a game; that one party is the aggressor (almost always the boy), while the other is defending herself; that there is a strict order of play, and you can’t stop until you finish. “If you’re playing baseball,” he elaborated, “you can’t just say, ‘I’m really happy at second base.’ ”

Teaching Good Sex – NYTimes.com found via Hairpin.com