Available in both the uncut, unrated version and an edited R-rated version (mainly for conservative rental stores like Blockbuster.)
The edited version replaces the shot of Marion and another woman having sex with two men with a shot of Marion partially clothed climbing on top of a man. Also, all the shots of the double-ended dildo and the shots of Marion and the woman having sex on it have been replaced with alternate camera angles and shots that hide any indication that the two are having anal sex on it. Some shots were also re-used to hide the close-ups of the two butts slamming together.
In the opening credits for the edited version, when the title card "Requiem for a Dream" crashes down, underneath it is a red box with red lettering that reads "edited version", making it clear to the viewer that they are not seeing the true version of the film.