Years before he continued to cause a stir in the cannibal genre, Ruggero Deodato directed this successful plagiarism of Roman Polanski's masterpiece 'Knife in the Water.' Naturally, as an Italian film, it focuses more on sex than the relationship between the central couple, but the enclosed atmosphere and interesting characters help maintain the tension, ensuring the film is engaging throughout its duration. The film's 'excitement' is far less than that of 'Cannibal Holocaust' and most of Deodato's other works, but it's clear that even in this early film, Deodato was a director with the potential to leave a mark on the film industry. The plot is simple and focuses on two couples. George and Silvia invite Irem and Barbara to spend the weekend cruising on their yacht. It soon becomes clear that George is not the most sensitive man in the world, and Silvia seems to have no problem with his mistreatment of her. The situation escalates as Irem and Barbara team up with Silvia to take revenge on George... and of course, there’s some three-way sexual activity.