Erótica
Two men commit a robbery. One is caught but the other escapes. He ends his escape on a lonely and deserted beach where he meets a beautiful woman named Erótica. They start a passionate love affair that is interrupted when the other con man escapes from prison and joins them. A sexual/sentimental love triangle begins leading to a violent confrontation between the two men.
Starring Jorge Rivero, Rebeca Silva, Jaime Moreno, Emilio Fernández, Elizabeth Dupeyrón, René Barrera
Watch "Erótica" on Amazon Prime released in 1979. It's a drama and thriller movie, and has a rating of 5.1 out of 10 from Imdb which is fairly okay for this kind of movie.