Porn is intended specifically to be clop fodder, and has no other use. If it has basically any other purpose except to clop to it (or trade it with someone else who’ll clop to it), it’s art. If it tells a story, illustrates a point of anatomy, illustrates an artistic technique, illustrates a concept, makes a point about an issue or argument, etc., then by definition it can’t be porn. That’s not to say you can necessarily show it to the students in the kindergarten class you teach, but it’s not porn.
As one Supreme Court argument put it, pornographic literature is an oxymoron. If it’s literature, that means it has literary value, however much or little. If it has literary value, it can’t be porn.