Sexy Sisters (1977)

We all know about the Pointer Sisters and the Andrews Sisters, but the Sexy Sisters (1976)? This perverse little gem directed by Grand Master of Euro-Sleaze Jesus Franco tells the story of poor innocent Millie von Stein (Karine Gambier), whose evil older sister, Edie (Pamela Stanford), is injecting her with drugs that turn her into an insatiable sex-crazed hallucinating lunatic in hopes of driving her completely insane before she turns twenty-one and inherits their parents' fortune. As part of this plan, Edie also enjoys a box lunch at the Y with the lesbian maid in front of her hallucinating little sister, whom she then offers up to all the men in town. Since all this takes place when Millie is drugged, Edie is able to convince her poor little sister that she's going crazy. Check out some sisters without misters when Karine rolls around naked in the surf with her equally naked female companion. There's something fishy going on here.