Poster for Anthony Newley’s infamous 1969 X-rated musical
Can Heironymus Merkin Ever Forget Mercy Humppe and Find True Happiness?:

Supposedly, Joan Collins (who was in the film, and married to Newley at the time) didn’t actually know what the film was about until after it was already made. It seems to have been a factor in the couple’s subsequent divorce.
And yes, I have the soundtrack album (which a woman was giving away!).