Le calde notti del Decameron (1972)

In 1300, Count Gianfigliazzo returns from the Crusades with two Black slaves, a boy and a girl, whom he uses for his pleasure. On the way home, he is also robbed of all his possessions by a mysterious Black Knight. But Gianfigliazzo does not care much, because the only thing he wants now is to make love to his wife, Peronella. When Gianfigliazzo arrives home with the young slaves and a vulgar friar who thinks only about having sex, he realizes that Peronella has lost the key to unlock her chastity belt, which she has worn ever since her husband left for the Crusade in Jerusalem. Matters become even more complicated when, through a misunderstanding, the Black boy—who had stolen the key—ends up in a convent, where the nuns, eager virgins, compete for him so they can make love to him. Fortunately, the enslaved girl intervenes and frees him from the tangle of seductresses, and the two young people manage to escape from the convent, while Gianfigliazzo is called back to arms once again for a new Crusade to the Holy Land to liberate the Holy Sepulchre. Peronella is also certain that she will have sex with her husband at least once before he leaves, believing she has finally found the key to her chastity belt. But Peronella is mistaken: her “prison” will not open, and Count Gianfigliazzo and his ragtag escort are once again attacked and robbed by the Black Knight.