Loose Ends(1985)

A frustrated Heather, never having had an orgasm, seeks out her old schoolmate Linda for new explorations into the mysterious world of lust beyond love. After an unbelievable performance in anal erotica between the two, Linda further bursts Heather's inhibitions as she leads her into the S&M world of Mistress Ann. Her domineering expertise of her two slaves, and kinkiest sexplorations by an anal minded supporting cast, ream Heather into sexual plateaus beyond all expectations.