Trying not to wade too deep into the struggle session here, but I keep having a thought
Hypothetical scenario: Let's say there's a teacher, specifically of middle/high-schoolers (aka they're def. watching porn), who happens to do porn stuff on the side: How do you deal with that situation, where students have very likely seen their teacher in explicitly sexual terms?
I'm not looking for a particular answer, or a fight for that matter, the above is by definition a gray area.
If it comes up in the school, in an ideal world the administration would discuss it with the student(s) if necessary, and implement material about sex work for the sex education
Even in that world you'll need an impenetrable skin, teens will be teens and bully mercilessly any weakness the adults show
Same as anything else, really. If they say or do something that's inappropriate, you sit them down and have a discussion about why it was inappropriate. Use it as an opportunity to teach the child the right way to treat other people. That's the whole reason why children have adults in their lives, to teach them right from wrong and protect them from harm. Children who are old enough to actively search for sexually explicit material probably aren't going to be harmed by viewing the sexually explicit material itself, but if they're viewing sexually explicit material of adults in their lives, then they should understand it would make those adults uncomfortable, so if they're going to look at porn they should stick to (consensual) porn of strangers (obviously with the caveat of "porn isn't representative of real sex and can be problematic in its own ways" but that's its own discussion).
You're going to get a lot of hopeful, but naive answers from people that mean well, but are arguing about a perfect hypothetical world.
What will happen in the real world with immature kids, is that some kid will find the pornographic material of the teacher, send it to their classmates, and the class will then proceed to relentlessly mock the teacher. There will be no respect and the situation will become untenable. The school will then face the choice of having to disipline dozens of students for inappropriate behaviour, which could involve multiple expulsions depending on how far the mocking went, or the school fires one teacher. What choice do you think most schools would make in such a scenario? I'd pick disciplining all the students and expelling those that leaked the pornographic material, but we all know most schools would not do that.