I mean, what's the alternative? That this is real? That some girl somewhere, had their brother come into their room with a 23andMe printout and then the sister went, "oh, if we don't share DNA, then suddenly I'm sexually attracted to you, the person I grew up with"?

Anyone who believes in that should perhaps go touch some grass, and I'm using that phrase despite immensely disliking it.

Just informing any of these incest-fetishists; as humans, we really don't have mechanisms to sense DNA, but we do have some built-in biopsychosociological(?) mechanisms for avoiding incest. One of them is when you grow up with someone in your family as if they were your sibling, you think of them as your sibling, and naturally don't want to fuck them, shared DNA or not.

Ofc not everything applies to everyone, but you know, in general.