Here's the solution – forget about all this and download the real version of the book from the internet.
Having said that, I'd happily pirate any content that someone censors, and not give any single penny to any censoring authority (for other non-censored content too) and wouldn't feel any guilt doing it.
Do the same with public libraries, except the new version is kept next to the almost porn books.
I haven't actually checked, but I would expect e.g. Naked Came the Stranger, Lolita, and Lady Chatterley's Lover to just be filed under "fiction". I'm not aware of a separate category for "fiction that some people do or once did consider scandalously erotic".
There is a category for actually-porn books, "romance", but you can't make any case for putting an edition of Roald Dahl there.