Naughty Nymphs (1972)

aka’s: Die Liebestollen Apothekerstöchter/
Blutjung Und Liebeshungrig/Passion Pill Swingers/Satin Panties

Two sisters and their lovers try to make sure their older sister (Sybil Danning) is deflowered by every man in town. They make a potency pill so every man chases her, with disastrous results. Also stars Eva Garden, Alena Penz and Christiane Maybach.