The Tempter (1974)

In The Tempter (1975), aka Devil Is a Woman, Glenda Jackson plays a nun obsessed with purifying the souls of those living in her hostel convent. Glenda doesn't show her Jacksons--that'd be sacrilegious--but if you want to see some beatific sacks, then Lisa Harrow is harrowing. First, Glenda peeks in on a topless Lisa. Let's hope she makes a habit of it. But it's later in the film that Lisa's true colors come to light--and they're pink! She's caught in bed naked and, rather than cover her shame, she raises her fig leaf for a full-frontal walk around the room. Tempting indeed.