Hmm. When it comes to the book bans in libraries, it seems the spectrum of it is actually pretty broad, and not sexual at all. Also, just because a book contains something "sexual" or some drawing of nudity, doesn't make it devoid of value.
It is worth mentioning that book bans don't just hit "school libraries" but "public libraries" too, so that might impinge on the rights of adults.
In any case, I think the more "provocative" content is probably a red herring for broader censorship.