That's because there really is no right answer or wrong answer. Good looking is down to a person's personal preference. What one person thinks is good looking, another will disagree. And most will think they are good looking usually do to inflated ego or seeking attention.
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Our looks and how we present ourself is to attract attention for a mate. Funny how twisted that became isn't it? xD
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Works the same way in nature. Humans are just another specie on this planet. More intelligent. But our nature is something we can not deny. It's in our DNA. Everyone analyzes everyone. And it works without thought.