Not A Love Story: A Film About Pornography(1981)
Found this doc via the Nightmares In Wax EP(Dead Alive before they were Dead Alive)
NSFW
TW:basically most you can think of. Graphic sex, restraints, violence, etc.
Its upsetting and still worth a watch. I can see why Gloria Steinem wrote in an essay from around that time that S&M was another form of patriarchy. Not commenting that is or is not.
The quality of the film isn't great. Its from 1981 and seems to have degraded a bit over that time.
Its on youtube, but not going to imbed it due to the graphic nature of the film. Just linking it.
https://youtu.be/FRNWU2Y-Q0c