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Also humans have inbred themselves for several hundred years, not saying that it isn't bad but it happens.
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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).