80s? Cinemas type sex movie strange bus scene.

I saw this some time in mid? 80snon late night cinemax. It was a typical cinemax sex comedy.  What I remember was a guy getting caught with an artist type woman by her boyfriend? And he flees with his erect penis encased in plaster or concrete or something hard.  He has to catch a bus and a strange woman bumps into it and grinds on him.  It always struck me as a sleazy scene.

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