What? (1972)

After escaping from a gang of perverts, innocent and beautiful Nancy, an American hitchhiker, flees to the sun-kissed summer villa of the lascivious elderly millionaire, Joseph Noblart, nestled somewhere in the Amalfi Coast. But, there, too, an endless array of eccentrics awaits the statuesque, blue-eyed beauty. There's Alex, a lecherous former procurer with peculiar tendencies; a German nurse enchanted by the work of Friedrich Nietzsche; a pair of tanned lesbians; a pianist with arthritis, and a stunning nudist girl. What is going on behind the mansion's doors?