I read somewhere that, typically, people tend to react more violently toward the concept of incest over the concept of other things like necrophilia and bestiality even though its generally the most consensual. Conceivably this is because we're wired to oppose inbreeding due to the genetic problems not being conducive to furthering our line. Of course, we're not all wired the exact same way.
However, I don't care what people do unless it hurts other people (I mean actually hurt them, not the 'it offends my ethics' bull). I certainly don't think they should have kids but I really have no control over that. Incest is preferable over...so many things. Would that it could be the worst a person could do.
Personally, however, I find the idea very squicky. I have a lot of siblings I'm close with, though, so it might just be that I can't understand how someone could feel like that for a sibling. I'm also a twin and have had some such lewd comments made about that which I've never appreciated. Bah.
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