The Marriage Revolution (1974)

The monotony causes a distancing between Begoña and Pedro, married for years and with a teenage son who only wants to play basketball. In addition, the father of Begoña (elderly and mentally unbalanced) also lives with them, so that coexistence becomes almost impossible. But to make the passion come back to them, they will devise a "revolutionary" strategy: Begoña will pretend to be a luxury prostitute named Cuqui and Pedro her client.