The dangers of being a peeping tom (or doing it in the woods). 1920’s, France. Probable Biederer.
Fredric March, Gary Cooper and Miriam Hopkins in the 1933 version of 'Design for Living'. A film based on the risqué polyamorous Broadway play by the same name. Yes, the story is everything you're thinking about, even between the two men. Oh la la. But the film version was watered down, its topic much too daring for the time.