This is a basic fact of evolutionary psychology (if you haven't read that post, go to Ev Psych Post).
Anything that leads a man to have sex with a FERTILE woman, is going to have a very strong payoff in leaving more descendants, and is therefore going to be a strong inborn behavioral tendency. All of the attributes that contribute to what we collectively, and men individually, identify as Beauty, are in fact indicators of fertility:
- thick, long, glossy hair and dewy skin are strong indicators of health.
- plump but not too plump is an indicator of fertility: a woman who is very thin is probably not menstruating, and a woman with a large waist is likely to be already pregnant...or too old for fertility.
- left-right symmetry of features: asymmetrical features, and other physical oddities, happen more frequently in inbred populations, which was a much bigger problem in hunter-gatherer times than it is today. And the inbreeding that tends toward asymmetry also tends to produce children who have hereditary weaknesses. Studies show that facial symmetry affects judgments of beauty.
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