A market research institute has just been given a new commission to conduct research on extra-marital sex. Secretary Elvira Schlecker calls up the the specialist Klaus Stossberger who gladly accepts the order.

A wife suspects her husband is cheating on him, so one day she follows him from home to see what--and who--he does on a typical day.

The writer Gellert catches Sybill, a striptease dancer and show onanist, at a sex cinema and hires her as a pleasure girl for his parties, where she has to influence business partners such as critics, publishers, bankers, etc. in Gellert's favor. There is a scandal when Daniela, the wife of the banker Vollmer, rushes off indignantly because she has no desire to watch her husband with Sybill. Another guest, the respected publisher Lutz, is the only one who does not make use of Sybill's charms, but arranges to meet her in private because he has caught fire for her.

Germany, 1981. State Security Service agent Harald Love is sent on a secret mission from the GDR to the Federal Republic, to verify an informant with the code name "Heinz" who is suspected to be a double agent. A job that may change his life forever...

Lars and Annette want to get married. They invite their parents to a get-to-know-you weekend and want to use this opportunity to announce their plan.