This is from the 1976 classic Water Power. It's a lot like Taxi Driver, except this Travis Bickle has a little fetish for forcing woman into doing enemas at gun point. The film is actually based on real crimes committed by an Illinois man dubbed the "Enema Bandit". Anyway he's dead now, so R.I.P you scat-loving motherfucker.
Vintage porno with incestual undertones makes me laugh. It also heightens my urge to be transported back to the 70's so that I can fuck the shit out of hippies along side mothers with beehive hairdos.