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Darwin's theory of evolution is far from foolproof in my eyes. If evolution is based ultimately in refining the gene pool or 'survival of the fittest', which contends that those with characteristics that do not support the passing of genes eventually die out, then how can we explain homosexual behaviour, which has no benefit in terms of passing on of genes for reproduction but seems to have existed from time immemorial, shouldn't this have died out according to these principles?