I guess we can safely assume you're speaking from experience, being the offspring of such a union?

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You say you believe CO2 is killing the planet? Then why don't you stop exhaling it?

But given Adam and Eve, are we not all in fact brothers and sisters?

We shouldn't be dating or marrying anyone!

How about uncle dating then? Is that ok? Suppose a person who is your cousin marries or dates your uncle. What does that make them? Cousuncles or Uncousins? Inquiring minds want to know. Just a little trivial info here, but notice that the word cousin also happens to contain the word sin. What does that tell you?

Old joke. Why do most single men in Arkansas go to family reunions? To meet girls of course.

Hey! Hey! Hey! I resemble that remark!

Not true for 2nd, 3rd and so one cousins. Highly authenticated Scientific resources even say breeding with a 3 rd cousin is the prime way to breed.

Having consensual sex with your cousin can sometimes cause temporary insanity.