The movie was actually based on a 1926 novel (Traumnovelle) which was written by Jewish German author named Arthur Schnitzler. Interestingly, Adolph Hitler called all of Schnitzler's work "Jewish filth". The book ends with the husband confessing everything he had done and promising it will never happen again. The wife tells him not to look too far into the future (meaning that he can't possibly promise such a thing because they don't know what will happen in the future) but that the important thing is that they survived their "adventures".

The author also kept a very detailed diary of his own sexual conquests and recorded details about his orgasms, so it isn't much of a surprise that his work was filled with sexual themes. Evidently, this upper class sex party/ritual thing has been going on for quite a while if this guy was writing about it in the 1920s. If you have ever looked into the degeneracy of the Weimar republic (Berlin became the primary sex tourist destination because literally any kind of perversion could be had for a price -- including child prostitution) -- you'll start to see why it was possible for the Nazis to come into power. Pornography has always been a Jewish dominated industry (and it still is in the US) -- so, it kind of explains why Hitler had such a strong dislike of Jewish people. Of course, he went off the rails with his hatred -- but it wasn't as if there wasn't some reason to dislike the way that Jewish people were influencing the culture.