From evolution's point-of-view,a young woman's childbearing ability is signaled by her:

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The "hourglass figure" is a shape where a woman's waist is significantly smaller than her hips and bust. This shape is associated with higher levels of fertility and estrogen, both of which are indicators of reproductive ability. Evolutionarily, men who were attracted to women with this shape would have had better chances of producing healthy offspring, so the preference for this shape would have been passed down through generations.

From Evolution's Point-Of-View,a Young Woman's Childbearing Ability Is Signaled by Her