Derek:

J. Brian’s Vitruvian Productions present A Film by J. Brian, starring Bob, Roger & Eric, copyright 1971 (14 min) – On a boat floating in the San Francisco Bay, a mustached blond stud and a slim brunet suck each other in all sorts of positions. Several minutes in, a third stud (another slim brunet) shows up and joins in the fun. Both brunets end up topping the blond and there’s sucking all around.