Sexy Sisters / Die teuflischen Schwestern (1976)

Two sisters live retired in a country estate. Their home is a golden cage and one of the sisters is very sick: she suffers from a terrible disease: she is nymphomanic! Milly has needs, which want to be satisfied – therefore Edna has to pick up some young men every night and bring them to Milly. Very soon, both cross all frontiers and addict lust and delusion.