Well if I was teaching Henry Miller in a lit class, I would probably point out that cunt is offensive but also that some literary tropes involve deliberate offense. It's my hope that students, at the college level anyway and maybe HS, can get to where they are sorting out their personal discomfort and not taking offense at the study of literature. Or language that, for the sake of art, goes off the rails.
Banks, I agree the possibility of censorship looms over all artistic expression where an ethos says characters or images cannot transgress in certain ways, and cause discomfort. A lot of great artists have aimed to make audiences uncomfortable. What I often can't tell is where a benign warning turns into censorship. When I was a teenager, any warnings on books were more like eyeball magnets. :-)