It doesn't require porn. Most movies, tv shows, rom-coms or dramas, have "unrealistic" depictions of "normal" relationships.

>Porn, let alone fetish porn, has a big problem because all the actors, including "amateur", are not only 'heavily used' and completely desensitized, but also the sort of people willing to publicly share video of themselves having sex.

Maybe, but none of that is germane to the subject at hand.

It's the responsibility of parents and other adults to keep children away from porn, and to teach them about sex and normal relations. Removing porn doesn't solve that problem because again the problem isn't the porn, it's the fact that porn is serving a role in educating people that society refuses to.