I checked the Wiki on it and found this
Harlan Ellison sues to block the film's release
Harland says they stole Repent Harlequin...
I don't know enough about intellectual property law to venture an opinion. The subject matter is the same but Harland's story is like an adult nursery rhyme, excellent but not translatable to film.
I have had fun through the years using the obscure story reference, Raoul Mitgong as my ID on various sites.