The Amorous Sisters (1980)
Original title: Julchen und Jettchen, die verliebten Apothekerstöchter
The Amorous Sisters is a 1980 German-language comedy movie directed by Erwin C. Dietrich, with a running time of 1h 16m. It stars Brigitte Lahaie, Flore Sollier and Jane Baker.
Comedy about some schoolgirls being taught anatomy (of the sexual nature) by the sexually frustrated Barbara Moose. In bed at nighttime the girls practice their daily lessons on each other and on any unsuspecting visitors of the night. When they're not in class they enjoy frolicking around outside (naked most of the time!) experiencing the joys of nature.