See Laura, we're left out once again.
I googled a tiny bit and from what I found it already seems somewhat doubtful they will release it. However, if you indeed mean there is an X-rated version I am at least rather certain that Warner won't release that. Maybe another studio may do so, releasing the Unrated (X) next to the R (like was done with "Thriller: A Cruel Picture"), but Warner releasing hardcore...?It does seem to be an interesting film and I would like to see it too. Maybe someone will release it eventually.
The X rating was received because of the subject and not the nudity. In fact there are some breast shown (maybe at 2 or 3 occasions) but no frontal nudity or man nudity and a lot of modern R rated films show more nudity than this one. I know the reason why it was rated this way, this is the end of the films that was disturbing at that time and probably is always today.Like I've said this is not a X rated film for the same reasons than Thriller, but most like Midnight Cowboy made the same year.
Title : Nighthawks (1981)One of the last good movie with Stallone before he became an Hollywood star and doesn't care anymore. Before you ask for me his last good movie is First Blood so I don't care for his career since 1982.