This story by Guy de Maupassant is part of a soft-erotic anthology, the “Série Rose” (“Softly from Paris” AKA “Secrets of Love”). (They were often announced without series title.) A couple from the country visit their cousin who must keep hidden from them that he runs a brothel.
Source is the German DVD that still has the French audio. I have myself added the English audio from a different source.
I would add the Spanish and the Italian if only they were available to me…
NOTE. The English edition was slightly cut, and there are a few seconds of silence where a line was not present.