Nun

The Nun and the Devil, or Le Monache di Sant'Arcangelo - by Domenico Paolella (1973)

The story involves the power struggles and sexual intrigues of a group of good-looking nuns at the Sant Arcangelo Convent and in particular the machinations of Sister Julia (played by former Miss Great Britain Anne Heywood) as she attempts, by any means possible, to succeed to the position of the dying Mother Superior. The nuns struggle with their vows of celibacy, some inclining to lesbianism whilst others invite male lovers secretly into their cells.

1577. The Mother Superior at the convent of Archangel is seriously ill. The determined and calculating Mother Giulia plots to become the next Mother Superior. She receives tough competition from tormented lesbian Sister Chiara and the lusty Sister Carmela.

Sister Act is about a Reno lounge singer named Deloris Van Carter who witnesses her mobster boyfriend killing an employee. She is then hidden in a convent under a witness protection program. She soon makes friends with the nuns, especially Sister Mary Robert, Sister Mary Lazuras and Sister Mary Patrick. After the Mother Superior catches Deloris going out to a bar in the night followed by Mary Robert and Mary Patrick, she orders her to join the church choir.