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.

Since her divorced father is bossing her around and her boyfriend Jürgen is cheating on her, Verena runs away to Rome to stay with her friend Piera. Piera's brother Giovanni is very interested in her and they soon try each other out, but at a swingers party it turns out that he actually shags anything that moves. When Verena's father arrives in Rome to pick up his daughter, he is distracted by French au pair Beatrice, who is no longer in Giovanni's employ. Back in Germany, one of Verena's new Roman friends comes to visit. Verena shows him around, but when he is invited to a party, he is horrified to discover that the event is an orgy for everyone.

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.

Felix, an extremely horny department head, does everything he can to nail his secretary. When he succeeds with some tricks, he realizes with horror that this girl is much hotter than he is. The two are surprised by the wife and the secretary is of course immediately fired. Helga has no choice but to look for a new job. As a waitress in a bowling alley she now works up the whole bowling club with some friends and becomes a real sperm robber.