1970s sex ed movie

Description: I don't know why anyone finds this funny. As a twirpy thirteen year old, I added a few captions to a disturbing short flick about training "mentally challenged" (we have to be politically correct, even if mentally challenged sounds worse than retard) individuals on sex. Basically, a young boy's creepy, incestuous, hebophile mother walks in on him masturbating and decides to have a rather...off the wall, one sided conversation about it. You'll notice the boy's right eye twitches when she's ...