If you're looking for serious answers around here, you would do well to ask questions that aren't hopelessly dishonest, but I will give you the benefit of the doubt for now.
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Amichai2 wrote
1) How does evolution explain human modesty? In what way is clothing more advantageous than fur? (Why) are we innately repulsed by public nudity?
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In order to have any question at all, you need to demonstrate that humans actually are innately repulsed by public nudity, as in many societies - especially in tropical climates - people are quite comfortable being topless in public. In some communities I've seen, men even wear gourds over their penises to make them appear larger and permanently erect.
It therefore stands to reason that such things as modesty are the result of human culture and upbringing, rather than genetics, and evolution by natural selection therefore has little to do with it.
You should also consider that humans evolved to their present form almost entirely in areas where clothing is not necessary to maintain a stable body temperature. The wearing of clothes was a cultural adaptation to allow humans to move into less temperate climates.
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2) Are Homo sapiens unique in their appreciation of beauty and art?
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That depends how you define beauty and art. Humans, as the only living animals that seem to be able to invent complex tools, would be expected to be the only ones to create art, but in order to answer that question meaningfully you would have to find very lucid definitions and find some way of asking other animals if they agree.
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3) How does evolution justify an appreciation for beauty?
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Probably more easily than you think. Beauty in one sense can be defined as symmetry of pattern. Our ancestors would have gained a distinct advantage from the ability to recognize patterns in nature, and, in a more obvious sense, in their potential mates. Symmetry in facial features can be used as a good indication of a person's health, especially in their development, and as such acts as an outward indication of competitive genes.
This concept overlaps with that of beauty as defined by sexual appeal, which combines the outward indication of symmetry with other features, - such as a pear-shaped body form and full lips in women - which can act as indicators of sexual arousal or child-bearing ability. Thus, an ability to recognize such traits would be highly advantageous to any animal that wishes to pass on its genes successfully.
There are many books for lay audiences which address these concepts. I would suggest a trip to amazon.com if you have more questions.