I have the feeling a lot of people don't understand what OP meant in the first message. (tell me if I'm wrong @tired_programmer).
I do not see anything like encouraging people to show porn to kids; rather encouragement to be more honest and less biased on this subject, so the kid won't need to look for potentially harmful material. I cite her:
What I see, is someone who has not be traumatized by porn (but she could have been), but has been traumatized by the negative vision of sex in her family (and the negation of the need for a kid to know about it).
I think it's interesting to note that if people had not refused to answer her questions, she would not have needed to search for porn, and would not have taken the risk to find something disturbing.
I also find a bit weird to see people saying that kids have no business knowing about sex. If they don't ask, obviously it would be weird and maybe prejudicial to them to tell them anything if they are very young; but if they ask, how can it be good to not tell them? By not telling, we prepare them to think it's something dangerous or wrong, and, because kids are not stupid, also something attractive that they are denied the knowledge of. Which is creepy. It's totally possible to teach kids that it's only for adults without refusing to discuss it altogether. It's also great occasions to do prevention while having the kids' attention. I know that in my case at least, all the prevention messages I got (the earliest very early, to warn against abuse) were understandable because I understood how these behaviors were deviating from what healthy sex was and why. Not a comprehensive knowledge, but I had the info that was corresponding to the questions I was asking myself.
When I was a kid, a questioning about sex could come between "Is the orange called after the color or the color after the fruit" and "what is there in the sky behind the last stars we can see". You answer everything, all answers are equivalent to the kid. You've just fed their curiosity and educated them. You refuse to answer one... well, you already teach your kid there is something wrong with some of their questions.. and this specific subject, without explaining to them why.
Having a good choice of media adapted to each age to help answering the questions seems like a good idea, because you're able to go through them beforehand and choose something that is a good compromise between what you are ready to tell and what the kid is wanting to know.