Expert help needed - Vintage American movie

I am looking for a particular American porn movie from the early 70's og late 60's which I saw as one of my first porn movies ever in an Adult Theatre.

I do not remember very much from the movie, I'm afraid, but one of the central scenes is in a big tub with a number of men with rather limb cocks and some women trying to get them up by the use of cock rings. And then there is a boss or a High priest (Black as I remember) at the side of the pool ordering two girls to suck his dick and get him hard.

I know it is very little to go with, and I have been searching high and low and used different search words without result.

So please if some of you experts could help, I would be very grateful.

Thanks a lot and have a great day

DaneJutland