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Most would exclude polygamy. Me personally I have the cut off at cousin marriage. Anything beyond that is too genetically close. I don't really care to justify it beyond just because. Its a universally held taboo so I don't expect much argument on that point.
Yeah, I agree with you, but there'a a reason why we think this way, and it's not arbitrary. Sex with family members is a great way to be a genetic dead-end, not unlike... homosexuality, bestiality, etc.
And don't get me wrong, I don't care if someone likes men or women, I stand by live and let live, but the fact that "we" approve of homosexuality and not other things is purely cultural. Which is why I say the arguments against other things are ad hoc. The truth is that we object to them based on biology.