Private Film 3: Anal Clinic (1993)

Two girls from London who are bored with their sex lives see an advert for Dr. Madelaine Dupont’s sex clinic and decide to respond. On the way, they meet a volunteer from the clinic and get a taste of the action before making their way for their full treatment. When they leave, the girls are boasting about the number of orgasms they’ve had and plan to return.