So another important aspect of this conversation about porn, I think, is how you were treated by your parents (or guardians) when it came to the subject of porn or how they treated it. I remember when I was a kid first coming into my sexuality, first discovering porn, probably a little bit before I really had access to the internet, they condemned it. I remember feeling a strong sense of embarrassment the first time I got caught looking at porn. Like I did something super seriously wrong. I felt guilt and shame. So obviously I don't think that's the way to go about treating your kid when you find out they've discovered what sex is.
If I ever have kids of my own, I think I'll talk to them about sex well before they ever go looking for porn.