Pasión prohibida (1982)

Classic spanish sexploitation directed byAmando de Ossorio (The Blind Dead Saga) and starring Susana Estrada, the goddess of Spanish “S” Rated cinema.
Teresa, a cabaret star, has to leave her work due to the death of her father. She decides to go to the small village where he lived to meet her brother, Miguel, who is going to marry Marisol soon. Teresa begins to feel attracted to Miguel, and tries to seduce him…
Basically, a movie about jealousness and incest. Some lesbianism  and a lot of spanish boobs.