Tara: Forbidden Pleasures (1979)

Sonia, a wealthy and mature woman, lives alone on a farm in a region that is being ravaged by a gang of violent bandits. Despite this, she refuses to take any steps to increase her security and even takes in Helena, the daughter of her fiancé Alfredo, who has had a serious falling out with her father. Alfredo, who also has a country house in the same area, follows his daughter, unaware that she and Sonia are in a lesbian relationship. At the same time, increasingly cornered by the police, the bandits take desperate action, raping Sonia, beating Alfredo and murdering one of Helena's friends.