How many of Philip José Farmers books were actually banned in the United States?
I see at least two problematic areas (neither are 100% clearly off topic, but not sure):
The question is not Sci Fi related. If the book WAS banned it was for erotic/violent content, not the SciFi one.
It's not at all clear that it was "banned" at all, since you can't really "ban" a book in the USA (1st Amendment issue), and only exclude it from certain kinds of libraries that would also exclude any other violent/pornorgraphic/erotic works.