I get how it could be seen as "natural", but I'm not sure to see value in that definition. From that token, most of human culture is unnnatural, but honestly it doesn't bother me much.

I'm glad we have books, even as it's not as natural as oral transmission. I love photography, I'm so glad we have chemical food that requires such a brewing process to come to fruition, and I have no desire to go back to a hunter gatherer society, I like civilization in general. And pornography is sure part of it.