Whether something is "natural" or not is entirely an invention of humans as well. The entire concept of "natural" is a concept humans have invented. If your body will accept someone else's blood and someone else's organs, it is natural.
So we've established that you don't actually care about life. Why is it that you want to force women other than your wife to carry fetuses to term when they do not want to? Or is this a question I'm going to ask you for pages and you're going to continue to dodge? I'll take a non answer as you don't care about life.