Homework (1991)

Virginia (Maria Rojo) is taking a class at film school, and has decided on her solo project for the class. She will film herself and her ex-husband Marcelo (Jose Alonso) (who likes to leave the light on) while they make love. She carefully positions a camera under a chair, and maneuvers her ex-husband into making love to her in front of it. Eventually her stratagems lead him to discover the camera and the ruse. At first, he is outraged, but eventually he gets into the spirit of the thing, and gets in a plug for his undertaking business while he's at it.