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This might be controversial, but there is a theory of sexual selection that tries to explain why people (and animals in general) select each other by some set of traits. It supposedly helps explain racial differences between populations which were isolated geographically over long periods of time. The theory says that we select on certain features being a certain way, even though they confer no obvious advantage, and these partly define a standard of beauty which is an arbitrary component of the standard. (One component is fairly objective: traits like symmetry, health of the skin, posture, strength; but this is an arbitrary standard that selects on some irrelevant traits.) Take for example the nose. One culture may favor a bulbous nose as a standard of beauty. Being able to grow a bulbous nose demonstrates that the body has sufficient extra resources to "waste" them on such an extravagance. The same thing happens in the animal kingdom and provides the classic explanation for why male peacocks with elaborate (and wasteful) tails are favored by females. If the organism has enough biological resources to waste them on these arbitrary traits that are favored by the opposite sex, it demonstrates an underlying health and vigor. Over time, those features tend to remain in the population since the animals which possess them are more likely to pass on their genes. And so this may partly explain "exaggerated" features like huge buttocks and breasts, or even features we take for granted like dark skin versus light skin. Of course, the explanations are always more complex in the end. Like why is there transexuality (not at explained by this aspect of the theory).
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