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Because they go out in the sun. Shit sort of just happens you know.
Or to be more scientific ultra violet light hits the skin and the melanocytes release melanin that helps protect the body from absorbing excess radiation, melanin then combines with oxygen to produce the color. While also producing vitamin D. Then genetics determine how fast or deeply ones body darkens if.
Though I am guessing this thread is some form of satyr of another thread and hence my smart ass answer as well.
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