El Currante (1983)

El Currante (1983) is a Spanish comedy. Beatriz Escudero is caught in the bubble bath with her lover. She sits up  and then gets out of the tub, showing off her gravity-defying boobs. Her man is clever, he had locked the door and then grabs a robe, but doesn’t give one to Beatriz, who shows off her nakedness as they hatch a plan. The man unlocks the door to let in the unsuspecting (fully clothed) couple and there appears no sign of Beatriz. That is until the dressed man dries off his hands on the robe, lifting it up just enough so we can see the naked Beatriz hiding beneath it, but our intruder remains ignorant.