If they are at university, presumably studying English Literature, I would have expected them to have encountered all these novels and plays already. Kidnapped was read to us at Junior school, as was Moonfleet, which I loved.
Presumably Titus Andronicus -may contain some upsetting scenes-, is banned.
Doing an English course which contained a section on poetry of sex and seduction we were advised that some poems contained offensive language. Boy oh boy they certainly did, not the sort to be found in a a poetry anthology, but as many of us were middle-aged, we survived. The younger members were embarrassed on our behalf, in case we didn't understand.