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当被问及如何选择最迷人的女性身材时，全世界的男性都会青睐时漏形体型，即腰胯比例大约0.7左右。但时漏体型的女人并不多见，在杂志画面上所见要远比真实所见要多。为什么这种理想的女性性特征与平均的体型不一致呢？

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Utah大学对十多个国家的女性的一项新研究结论表明，男性所需的体型与女性的最佳体型并非必然一致。有着时漏体型的女性，即那些有硕大的乳房，宽大的髋骨和纤细的腰肢的女性却有着不佳之处：她们多肌肉不发达或体力不佳。而那些上下一般粗体型的女性体内则有较多的男性激素，例如睾丸酮，这在承受窘迫环境时，例如当食物匮乏和生存希望渺茫时是十分宝贵的。

研究的作者Elizabeth Cashdan 解释说，“腰胯比例对男性可能的确是有诱惑力的特征。”但到了求生存时，女性也需要“体格健壮，耐受力强，理财成功和政治上有竞争力。”在女性的身体进化过程中，Cashan 认为，“男性的偏好并非是唯一要素。”

Why all women aren’t so curvy
When asked to choose the most attractive female physique, men around the world are drawn to an hourglass figure, with a waist-to-hip ratio of about 0.7. But hourglass figures are quite unusual—far more prevalent on the pages of magazines than among real women. Why is it that the sexual ideal and the average body aren’t the same?

A new University of Utah study of women’s figures in dozens of countries has concluded that what men want and what’s best for women are not necessarily the same. Women with hourglass measurements—with large breasts, wide hips, and small waists—tend to be more fertile, studies have found. That’s probably why men have come to prefer them. But the high estrogen levels indicated by a tiny waist and big hips have a downside: They do not lend themselves to muscular strength or endurance. Women with more straight up-and-down figures have more male hormones such as testosterone, which are invaluable in stressful situations, when food is scarce and survival is tenuous.

“Waist-to-hip ratio may indeed be a useful signal to men,” explains study author Elizabeth Cashdan. But to survive, women also need “to be strong, tough, economically successful, and politically competitive.” In the evolution of the female body, Cashdan says, “men’s preferences are not the only thing that matters.”