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actually, the reason that most people feel repulsed by their own family but not by others is a simple biological thing. the human mind (and body, but i won't go into enzymes and what not) is set up to avoid incest in all but the most dire circumstances.
therefor, it's natural to avoid incest with your own family, but with everyone else, who cares, they're not related to you, so it's a nice ol' gene pool to spruce up...
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