The Sinful Nuns of St. Valentine (1974)
Director: Sergio Grieco
Stars: Francoise Prevost, Jenny Tamburi, Paolo Malco, Franco Ressel
This film is referred to as a "nunsploitation flick." The rule of the day at this convent is that if something is worth being done, it's worth being done topless, whether that's getting tortured, contending with drought, or slowly losing your grip on reality. For those of you who are lured in, at least go in with this review that lists all of the "random gratuitous breast shots" in the film.