A Clockwork Orange, kinda sorta. Fast motion is used during the orgy scene. However, they're also playing Bach in the background. In typical Kubrick fashion, he's going for a kind of black comedy feel. We've already seen how dangerous and sociopathic Alex and his droogs are. The comedy comes from juxtaposing this with them drinking milk at a futuristic milk bar, and picking up two beauties to go back to his place and have group sex to classical music.

If anything, the whole scene helps shed some light on what the inside of Alex's mind looks like, and it's clearly a crazy and disturbing place. Fast motion? Sure, bring it on. Couldn't make things any weirder.