I don't really see the attraction, but I will say that incest taboos vary among cultures. In some, only the children of your mother are "off limits" (meaning that if your father fathers children by several different women, then only the ones where your mother is the same is taboo). So, I believe there's a cultural component. Still, the aversion is meant to prevent the accompanying health issues. Yes, they take several generations to become pronounced, but if there was no prohibition, we'd eventually be quite messed up genetically.
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