Roman Porno from 1972.
A gang of vicious thieves and rapists invades the isolated summer home of a wealthy but morally corrupt family.
Two couples engage in adulteries with each other then discover the joys of wife swapping when they meet another free spirited couple.
A young couple and his wife's sister live in a housing complex. When her wife becomes suspicious of the relationship between her husband and her sister, she falls into an unexpected trap.
