What film?

Ok, while I was watching Requiem for a Dream, at a certain time in the film, I remembered a film I saw some time ago (because in rfad some girl had to fuck someone for money, and in the other film the same thing happened, or sort of).
I still remember one character of the film, a person with glasses who was a bit of a wierdo, and it was in his house they had to get in. I also remember that girl being tied up with handcuffs to a snookertable, and in a part of the film, she was put in the trunk of a car while playing dead and an other character (her friend) went to bury her but the wierdo wanted to be with him yada yada..

I know this is vague, but the film! I'm hoping on a miracle like TosspoT's :<