It is the teacher's responsibility to evaluate any materials they present to students. If they are given an output they interpret to be pornographic, they decide whether to provide it or not to students. I imagine it is possible that you might determine something to be pornographic that a given teacher may not. Pornography is an interpretation, which varies culturally and politically. Regardless, it is definitely not my responsibility to prove what ChatGPT will provide whatsoever, I don't work for OpenAI.