...And Give Us Our Daily Sex (1979)

erónica and her friend are two very sexy bisexual nurses who live upstairs from a rather boring couple and their teenage son. In a science class at school he learns how to build a periscope, and uses it to spy on the nurses sexual antics. Meanwhile, Albert's mother is being even naughtier than her precious boy, sneaking off for some extra-marital sex while her hair-obsessed husband is at the salon, having his follicles tended to. (imdb)
Cast and Information
Directed By: José Ramón Larraz
Written By: Sergio Garrone, José Ramón Larraz
Starring: Laura Gemser, José Sazatornil, Bárbara Rey, Ángel Herraiz
Genre: Comedy
AKA: El Periscopio