Gianluca 'Giangi' Tosi (played by Renato Pozzetto) is the director of his father-in-law's tap factory, the strict commendator Balestrazzi (played by Loris Zanchi). The pressure of corporate responsibilities begins to undermine his mental and physical health. Giangi also has to deal with complaints from his wife Maria Luce (played by Francesca Romana Coluzzi) and his mistress Silvana about his sexual problems.
The situation becomes even more complicated when Giangi meets Luigi Carminati (played by Teo Teocoli), a factory worker with a reputation as an irresistible conqueror with extraordinary sexual skills. This arouses strong envy in Giangi and a desire to surpass Carminati.
Initially, Giangi tries to make Carminati's life difficult by assigning him the heaviest tasks, but he fails to challenge the worker's sexual potency. Later, on the advice of psychiatrist Bauer (played by Walter Valdi), Giangi tries to establish a friendly relationship with Carminati, but his attempts to live the life of a worker are unsuccessful. Finally, Giangi invites him on a cruise on his yacht to prove that a worker cannot conquer upper-class women, but the plan fails when Carminati seduces Giangi's wife.
Giangi is eventually admitted to a psychiatric clinic and pretends to be insane to avoid returning to the company.