Il paese del sesso selvaggio (English: The Country of Savage Sex), also known as Man From Deep River, Deep River Savages and Sacrifice!, is a 1972 Italian cannibal exploitation film directed by Umberto Lenzi and starring Ivan Rassimov, Me Me Lai and Pratitsak Singhara. It is perhaps best known for starting the "cannibal boom" of Italian exploitation cinema during the late 1970s and early 1980s.

It is theorized that Lenzi was trying to imitate the content of notorious Mondo cinema, which had gained considerable popularity in grindhouse theaters since Gualtiero Jacopetti and Paolo Cavara had made Mondo Cane in 1962, even though this film is fictional. Like Man from Deep River, Mondo films often focus on exotic customs and locations, graphic violence, and animal cruelty.

The film and its title were mainly inspired by A Man Called Horse, which also featured a white man who is incorporated into a tribe that originally held him captive.

British photographer John Bradley is assigned to photograph wildlife in the Thai rainforest. John attends a boxing match in Bangkok with a woman who becomes frustrated and walks out on him. An unidentified man then follows John to a bar and confronts him with a knife, but John turns the weapon against the man, kills him, and flees.

The next day, John rents a canoe and guides to take him down the river into the rainforest. The guide, Tuan, mentions his concerns about traveling so far, but John agrees to return after one more day.

John falls asleep and awakens to find Tuan dead. A native tribe captures John in a net and carries him to their village, where the chief, Luhanà, is told they have captured a large fish-man. John is then hung in the net from a pole and witnesses the execution of two war criminals by the tribe, which is at war with another more primitive tribe of cannibals, the Kuru. John labels his captor tribe as murderers.

Hanging in the net for hours, John attracts the attention of Marayå, the chief's daughter, who convinces her father that John is not a fish-man, just a man. Luhanà agrees to release John as Marayå's slave and locks him in a shack, where Marayå's governess Taima, an English-speaking missionary child, tells him that he will be released as Marayå will be soon married to Karen. Luhanà interrupts and unties John because it is the day of the Feast of the Sun. When a helicopter flies overhead, and John attempts to be rescued, he is subdued by warriors who nearly kill him, but Marayå intervenes. John then plans an escape, and Taima agrees to help.

One month later, a building accident kills a young laborer. As John watches the funeral ceremonies and is shocked by the rituals of the natives, Taima tells John that now is his time to escape. He does, but Karen and a group of warriors corner him, and he kills Karen. Afterward, the tribe incorporates John as one of them, putting him through rituals and torture until he is released and accepted as a warrior. He uses his knowledge of modern technology and medicine to help the tribe but then becomes an enemy of the tribe's witch doctor. John and Marayå become fond of each other and are soon married. The two consummate, resulting in her eventual pregnancy, but a black butterfly flies over the two lovers during conception, portending doom.