Apologies then.
However, I can speak from my experience as a kid in the early nineties, before internet porn had taken off.
I remember being exposed to a scene in Wings where the characters discussed sex and kissed while laying on a bed around 1990 when I was 7 or 8. I asked my Mom what sex was. She got angry at my 11 year old sister for watching the show and for a while it was no longer allowed. That did not stop my curiosity, and I kept asking.
My Mom finally got some drawn book and some other book she expected me to read, and I probably looked at the drawn one ten times and the other one I do not think I ever actually really opened. That wasn't what I wanted. I returned to her to ask what sex really looked like, what a vagina looks like, and that sort of thing. I reminded her that she told me many times "if you ever want to know anything, ask me, I am here to teach you, yada."
After another year or so of pestering, she allowed me to see a Playboy. You may know, Playboy does not show sex scenes and does not show vaginas. This did nothing for my kid curiosity. I was not interested in girls. Girls were gross and had cooties and were not allowed in the play house. It was not sexual. It had become a mystery I had to solve, what did a vagina look like, and why is Mom so scared of me seeing it?
When we went to Europe for a family trip, I was fixated, and I discovered Europe had much more accessible porn magazines. At the mall in America, the Hustler magazine was close to the register and always visible to the cashier, but, at airports in Europe, I discovered even looking 10 I could walk right up to the porn magazine area and no adult even seemed to care, they chuckled or smiled. In fact there is a nude magazine made for kids printed in Germany which one of the employees directed me to.
I was not terribly into it, so I went back and looked through some European porn magazines with fully frontal nude shots. I was young enough that I honestly was not sure why this was something I had been prevented from seeing. I did not find it appealing, but the mystery was solved, somewhat. I was still confused why I was prevented from seeing this before, but, even once telling my parents I had seen it and wanted to know what is so bad about a photo of a vagina, nothing improved. My parents clamped down harder, and I went to greater lengths to obtain porn. It became sort of a competition, and as it went on, it turned into a part of my sex life in a large way, where I would seek sexual partners my parents did not approve of to recapture that adolescent feeling of my sexual beginning.
I will probably not leave this post for super long because it delves into my personal life a bit but, I guess I disagree with you. It should not be up to the parent. It should be up to the child. If the child is watching porn on their tablet, the response should be a teaching moment, not a confiscation and grounding moment. You cannot control things these days anyway. TV is tiny compared to internet in the lives of modern American children, and every friend has internet, and half of them have no parental control on the device, therefore, you can never win that way. You just have to teach them the lessons when they decide it is time. That is my perspective only.