CineKink (mildly NSFW). I'd love to go to this some year.

S&M Judge. Despite the corny and too-on-the-nose title, this looks rather good. It got a solid thumbs up from the NCSF (National Coalition for Sexual Freedom).

Kenneth Anger's aborted attempt at The Story Of O.

Año Bisiesto which won this year's Camera D'Or at Cannes supposedly deals with the subject in a manner both fair and unflinching. I think it's going to be distributed in the US by Strand Releasing...

The latest film from Eric Schaeffer, After Fall, Winter explores the subject of the relationship between an American writer and a French dominatrix.

Edit: and it completely sucks.

High school sado-masochism -- Akihiko Shiota's Gekko no saseyaki / Moonlight Whispers (1999).

Warning -- Apparently some copies of the Region 1 DVD were defective, and wouldn't play the end of the film.

Tokyo Decadence is likely the best film I've seen on the subject matter. The film has a very Lynchian lyrical ness of the film. It's the story of a young timid college student walking through BDSM scenes in an economically collapsed Tokyo. The scenes blend between the horrific and the sexual, it was good enough to merit a sequel Tokyo Decadence II which is more of a hyperactive version that reflects the anime aspect of Japanese culture.

This is a major thread throughout Kōji Wakamatsu's work, perhaps most explicitly in The Embryo Hunts in Secret, and Shunichi Nagasaki's Heart, Beating in the Dark would probably worth checking out for those with an interest in the subject.

I think 'Maitresse' featured a number of actual dominatrix clients.
Bulle Ogier to me looked very convincing in her 'switches' of mood,-in and out of costume,- and it featured another fine performance from the Golden Age of Depardieu, when he hardly put a foot wrong

Universal/Focus have just picked up the film rights for the 50 Shades Of Gray trilogy, which started life as Twilight fan fiction and has now sold very well (especially with women).

I haven't read the books, but from what I've read it reads more like a trashy paperback with Fabio on the cover than anything by the likes of Laura Antoniou and Pat Calfia. So the possibility of what may end up being a watered-down version of Secretary with clear nods to the Twilight stories is for someone like me, possibly vomit-enducing.

From what I gather, all of the Twilight references have been scrubbed, but that may be small consolation.

Yeah, but from what I'm hearing the influence runs pretty deep in them still. Removing any personal misgivings I might have, I can kind of see how it would be able to work as a Hollywood franchise, albeit maybe not as widespread as the Twilight and now Hunger Games craze is. It's also possibly playing off of Sony's attempt to make the Millenium trilogy a "franchise for adults".

Trailer for Kink (very NSFW). Trying to define this through the spectrum of a (albeit well-meaning) porn company is akin to trying to find out the secrets of greco-roman or Olympian style wrestling by watching Beyond The Mat. Oddly enough there was a Canadian series with the same name as this film that aired for five seasons (and the first two of which are streaming on Netflix and Amazon) that I felt sort of covered it on the normal level, of people who do it in their personal lives and find their love and affection through it. But I'd be very happy to be wrong about this, though. If people come away thinking of this in a different light, then I have no room to complain.