Hot Figs(1978)

Original title: Heisse Feigen

The young, pretty Miriam is invited by her boyfriend to a group sex party in the club of the permissive. When she realizes what it's about, she refuses and gets into a disagreement with Joan. Joan simply leaves her in the woods. Miriam finds refuge with an open-minded couple, who initiate her into the secrets of pleasure in threesomes. Now she has a taste for it, she can live out her sexual fantasies and gets to know herself from a whole new side. Even your girlfriends, who incidentally also have it fist thick behind the ears, enjoy a real fountain of pleasure.