"The bear flips Leo over and thrusts and thrusts during the explicit mauling," the Drudge Report said, claiming the bear raped DiCaprio's character "twice".
Bits of the scene can be seen in the trailer for the film.
The Revenant is garnering plenty of press thanks to the hardships cast and crew faced on the set of Alejandro G Iñárritu's new film.
DiCaprio, who also eats bison and sleeps inside an animal carcass in the movie, called it "the most difficult film ... that any of us have ever done."
In it, DiCaprio star as fur trapper Hugh Glass, who sets out on a path of vengeance against his hunting team who leave him for dead after a brutal bear mauling.
During filming, DiCaprio's eyes froze shut when he was caught in a "brutal" windstorm.
The 41-year-old actor was working in horrific weather conditions which lasted for an hour in temperatures that dropped to minus 40.
He said: "We were doing an emotional scene, and then this windstorm came, and it was just brutal.
"We were out there for an hour, and I said, 'Alejandro, what the hell are we doing?'"
Despite the freezing conditions, director Iñárritu encouraged the cast of the Western thriller to forget about the cold climate.
He said: "It's a mental state. Weather doesn't exist."
DiCaprio lived to tell the tale and admitted he was extremely grateful for a hot air blower on set which he nicknamed "the octopus".
Other cast members include Tom Hardy, Will Poulter and Domhnall Gleeson.
- Agencies
