There are many ways to surprise an audience. One quite odd way is to leave out ANY kind of surprise the audience would expect. This, however, is not a very pleasant surprise because it gives you the strange feeling that you have wasted your time.
In writing and directing this film, Wolfram Paulus has simply taken the classical romantic-comedy/adultery scheme and refused to add anything else. I award an extra star for this really bold procedure, dared at a time when (romantic-comedy/adultery) movies were 100 years old and his film was not the very first most viewers had seen in their life.
Obviously, Paulus's leading couple was happy to earn easy money. Zirner and Flint are all right, but they can't make the film more exciting than it is conceived to be. The best performances come from the Austrian actors who play the cheated partners: sweetly naive Gabriela Benesch on the one hand, and the great Georg Schuchter (who died much too early) on the other.
The rest is silence. Really. You cannot say more about this film because there is nothing else.
?