Private Film 1: Anal Academy (1993)

The headmaster of a small British public school for girls is outraged at his six pupils' outrageous behaviour. They flirt with the groundsman, the male staff and even among each other. He hires a new French mistress (Tabatha Cash) who misconstrues his instructions and sympathises with the girls' plight. They arrange a ruse: drugged coffee. While the head teacher is asleep in the staff room an anal orgy takes place around him and incriminating photographs are taken. Teachers and staff end up happy, with the partner of his or her dreams.