The House of Lost Women 1983 one on netflix

Desdemona lives on an isolated island with her strange family: her father Mario, her stepmother Dulcinea and her mentally challenged sister Paulova. As the only inhabitants on the island loneliness and desolation engulf all members of her family. Desdemona tries to ward off her boredom by taking long walks along the beach or engaging in acts of self-gratification. She often tries to seduce her own father Mario to engage in acts of a sexual nature. Their daily routine is interrupted by the arrival (by boat) of a robust male stranger who brings friction into Desdemona’s family.