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More desirable women have more bargaining power on the mating market, and they can elevate their standards. They want higher levels of resources, education, and intelligence; higher social status; good parenting skills; and raft of other traits. American men with resources are more likely to marry physically attractive women. Most men can obtain a much more desirable mate if they are willing to commit to a long-term relationship because women typically desire lasting commitment, and highly desirable women are in the best position to get what they want.
Men are preoccupied with a woman's youth. Men want wives who are pretty, attractive, beautiful, gorgeous, comely, lovely, ravishing, and glamorous. Men seek attractive women as mates not simply for their reproductive value but also as signals of status to same sex competitors and to other potential mates. Although most men place a premium on beauty, it is clear that not all men success in satisfying their desires. Men who lack the status and resources that women want, for example, generally have the most difficult time attracting good looking young women and must settle for less than their ideal. Indeed, a man's occupational status seems to be the best predictor of the attractiveness of the woman he marries. Men who are in a position to get what they want often partners up with a young, attractive woman. As a man's income goes up, he seeks younger partners.
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David M. Buss (The Evolution Of Desire: Strategies of Human Mating)