Well Rachel, maybe. And thanks for this info.
But I don't trust Google.
And IMHO:
all this "adult" business is a big scam and a deflection.
I don't know of any Bible passage where sin is defined by how old someone is.
The whole idea of "adult books," "adult entertainment," "adult beverages" "adult movies," etc. is a big smoke screen for excusing sin while allowing persons to still call things inappropriate rather than sin with the claim that they are only inappropriate if children are exposed to it. And if you expose both children & adults to pornography, the adults are more likely to be moved to fornicate than are children.
Creating web browsers for children, is unlikely to result in children not getting access to sex & violence via regular browsers.
YouTube (owned by Google) has pornography on it.
Pandora's box has been opened. I doubt it will be closed until civilization is destroyed or Christ returns.
It seems like you underestimate the general parental tendency towards protecting children from porn. That parents would protect kids from porn at all also means they understand in some way its negative influence on human beings. Adults are more likely, of course, to derive pleasure from porn, but it doesn't take away from the fact that adults are also more likely to percieve porn in a more adult manner than children. If there is such a thing as using pornography responsibly, adults are more inclined to it.