A lonely nerd hires a dominatrix on his birthday, setting up a series of role-plays designed to convince her she is his mother reincarnate, and she deserves revenge.
InformationRap
This is one of the few movies I've ever seen where the whole audience broke into spontaneous, loud applause a third of the way in.
Griff Lees
Very good movie overall, highly recommended. Most of the negative reviews don't have any merit and are all pollitically based. Give this movie a chance at least, and it might give you a different perspective.