Here is the list of the 100 most frequently challenged books 1990-2000 as compiled by the American Library Association. I was surprised to find that I have read 19 of them, although read may be a bit over the top when it comes to 19 and 88.
I’ve read 41 of them for sure, and possibly 3-5 others.
What I wonder, though, is what sort of libraries challenge them. They don’t just mean school libraries, do they? If so, the judgement of some people - who apparently wanted some of these books in the libraries - is pretty suspect. You’d have to be half-crazy to think the average school is going to welcome books like the joy of gay sex…the school needs to take parental reactions into account, after all. Wait, this page says 71% of the challenges were in fact school libraries. Hmm.