A successful ad man engages in illicit affairs in this romantic comedy satire. Serge (Serge Gainsbourg) is an annual winner at the advertising awards festival held annually in Venice. When he meets the pretty British woman Evelyne (Jane Birkin), he sets her up in an apartment and plans to leave his pregnant wife. The newfound love of the immensely shallow couple is shattered when Evelyne runs off to marry a speedboat racer. Serge continues working for the advertising firm and continues his search for love affairs without commitment