What (if any) books would you ban from a high school library? Are there certain subjects that you feel are inappropriate for teenagers regardless of literary merit?
I'd think twice before including, say, The Kama Sutra.
Please read the question before objecting on principle: it specifies high school library.
On the flip side, I'm interpreting "ban" loosely, in the sense of "if I had a job purchasing books for a high school library*, I would probably not choose to purchase this item for the shelves."
Oh, I also might question the wisdom of including the private collection of Rupert Giles on the shelves of a high school library. You know, the "don't speak Latin in front of the books" books.
*This would, in fact, be a job I would love.