Monica in "Le Fate" (1966), an episodic Italian sex comedy (just a few thousand of them were made during the Sixties), featuring Monica along with Claudia Cardinale, Raquel Welch, and Capucine.

Talk about a murderer's row of international suberbabes!

Best in the original Italian with subtitles, for Vitti's and Cardinale's smoky voices — if you can find a decent copy (try iOffer).