"It's part of the male identity," says University of Connecticut psychologist James O'Neil. "We strive for success and upward mobility." But those who achieve high status still enjoy more sex with more partners than the rest of us, and the reason is no mystery. Researchers have gathered voluminous data on women's mating preferences over the past half century. They have studied primitive societies, conducted international surveys, run lab experiments"”even analyzed personals ads"”and they have consistently found that women favor signs of "earning capacity" over good looks. For sheer sex appeal, a doughy bald guy in a blue blazer and a Rolex will outscore a stud in a Burger King uniform almost every time. Power, it seems, really is the ultimate aphrodisiac.