Erwin C. Dietrich - Sechs Schwedinnen im Pensionat AKA Six Swedes on a Campus (1979)

Miss Klein runs a boarding-school. The schoolgirls chloroform a peeping Tom, lock two plumbers in the dormitories, strip for a gamekeeper and tease their sports teacher. The teacher gets carried away in front of the class while giving a demonstartion of sexual positions with the gym teacher. Kerstin gives a sexy turn to their biking through the woods by attaching dildos to their bicycle seats. These move up and down as they pedal.