"I know I'm dirty" scene from 20.years ago

Does anyone remember a scene where a guy is jerking in a brunette girl's face and she says "I know I'm dirty." I can't remember who the girl was or any other details of the scene. I think it was two or more guys in the scene but it may have just been one. I know it's not much to go on, but I'm hoping someone remembers it.
 
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