Although Roxxor's wording is horrendous and is deserving of a 2 year ban, he is absolutely right. There's no actual reasoning behind why human interaction is unnatural. Why is it considered unnatural for a human to get rid of the fetus inside of them by killing it and sucking it out, but natural if they press it out through their vagina, alive?

What he's really getting at, is that "natural" and "unnatural" are completely meaningless words under nearly all circumstances, and you should think very deeply before you choose to use them.