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Sometimes, homosexuals reproduce with members of the opposite sex. It might be a slight disadvantage, but it doesn't preclude the transmission of genes either.
Now, the principle you're getting at probably isn't one that you want to follow through on. One of the greatest accomplishments of human civilization is that we no longer have to be subject to natural selection.
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"Erections lasting more than 4 hours, though rare, require immediate medical attention."
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