Where can I find this 80s movie where Ron Jeremy anals a girl with movie popcorn butter?

This was a movie I watched on VHS back around 1985 +/- and was my first ever rented porno. I want to say (pretty sure it was) Ron Jeremy and they were in a movie theater. "Ron" took a girl into a closet for butt sex. In the closet was a popcorn butter dispenser and Ron used that to lube his penis before entering her asshole. It has been 33 years; I remember it being Ron Jeremy, it may have been someone else with a big schlong and hairy body.