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.
You’re sort of describing “After Hours” directed by Martin Scorcese.