Why would porn that was mostly aligned with the values taught in sex education in your country result in porn being banned?
It might result in a defacto ban of types of porn that are the polar opposite of those values, such as voyeurism or revenge porn, but I'd imagine there would still be a very broad range of porn on offer in most places.
I'm surprised by the lack of support for this idea. Why not make Pornhub's content and algorithms be aligned with the values around sex of your society, rather than just what maximises their profit?
Perhaps there's some uncomfortable cognitive dissonance stemming from people thinking about the porn they consume compared to what they want their kids taught about sex which explains the lack of support for this idea.