I know nothing about the underlying themes or premise of anime, other than (I believe) it's Japanese origin?
However - I do see the various ads and porn clips. From a position of ignorance, I don't see it any different than if they had developed porn of Wilma & Betty, or Vilma & Daphne, or Veronica & Betty. Those are the Flintstones, Scooby-Doo, and Archie characters, for those who are younger.
If they'd had that - I'd have watched it, and got off on it. To someone who grows up on anime, I imagine it looks just as real as a cavewoman depiction from the 60s; so therefore, a dude can jerk off to it.
I'm sure others have a deeper understanding. But some guys were drawing stick-figured naked woman on walls back in ancient times-and I bet that worked for their imagination just as well.
https://publicdomainreview.org/colle...antiquity-1785