Alright well since I cannot post a scene from the classic movie, because it is on a tubesite, I will do my best to describe it. A mother takes her geeky son (Willard) to a disco orgy a couple times in order to get him laid. He unknowingly has sex with her at some point during one of the visits. The mom has glasses and pearls on. I'm just trying to find the full length movie from this few minute cut scene. It look to be from the early 80s. Thanks.