Orgia Familiar (1986)

Sexually liberal couple get excited about the arrival of a new neighbor. Realizing the interest, he approaches the couple, and, cheating on his girlfriend, begins to have sex with his wife, under her husband's eyes and approval. In parallel, the couple's daughter wakes up at once to desire, when she observes two friends exchanging caresses. The mother ends up encouraging the daughter to participate in sexual games, until things get complicated when the lover starts to direct his attention to the teenager.