So, just watched "Filth" the movie starring James McAvoy.
It is worth checking out if you're into strangulation at all.
There are multiple scenes of James McAvoy's character having sex with a lady, where she wraps a black cord around his neck while they have sex. In at least once scene, he does the same to her.
Later on, she jumps him and strangles him, demanding he get hard so they can have sex. He starts to hallucinate and blacks out.
And I don't want to spoil the ending but ... well, there's something there of interest too.
You can find this film on Netflix Instant, in America at least, I don't know about international Netflix.