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Incest is bad because of the population bottleneck.
I'm not against homosexuality at all but I'm guess that if we all turn into homosexuals one day, human kind would go extinct? That always used to be the one thing that nagged me about homosexuality (without considering in-vitro fertilization; correct me if I'm wrong please).
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There will never be only homosexuals, though. If anything, our population is huge and continuing to grow. We probably need to reduce the growth of the world population.