Hungry Young Women (1974)

aka's: The Intruders/Fait Acompli/
Inkräktarna/Let Us Play Sex/
Swedish Sex Games

Richard (Gilda Arancio) learns by chance that the wife (Jacqueline Laurent) of an atomic scientist (Borje Nyberg) is having an affair, while their son (Stellan Skarsgard) was driving a car drunk and without a driver's license. Richard uses this knowledge to commit sexual blackmail with the family members and start an orgy! ADULT CONTENT.