For example, in humans it’s theorized that women with wider hips have a better chance of a successful birth, therefore men are more attracted to wide hips. Like how can my brain know that wide hips is a good genetic trait and pass this attraction to wide hips to my offspring?
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Because being attracted to beneficial traits means that your offspring are more likely to have those same traits, which in turn propagates both the trait and the attraction towards it.
Run that circle for a few hundred thousand years, and you’re going to end up with instinctive grooves which tend to favor “healthy” appearance.
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