Why are there so many on this site interested with incest?

I get these kinds of questions once in a while.

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Some people come on here just to outrage or upset people. They can count on the subject of incest to do that since it is a fundamental taboo in all cultures throughout human history.

Dino30 · M

Yes but more do it than people might think. I think it happens a lot between siblings. I know of several cases.