If that's the word, then I for one would be complaining to the shop....
....that the punctuation is terrible.
Surely it should read "F***ing RECYCLE!". Without the exclamation mark, it's just a meaningless combination of words. Like the sort of t-shirts you see in Japan that have a random combination of English words. With the excl. mark it's a command, an exhortation, which is surely what's intended?
In my view this book obviously crosses the line into pedophilia. I don't want to get into a boring discussion about artistic freedom. Protecting our children trumps that. Personally I would have doubts about another book you are displaying called Gothic Lolita.
I ask you both to remove the book and reply to this email.
The books continued to be displayed for some time.