Film-maker Vincent Gallo has hit out at a movie critic who suggested he used a fake penis for a controversial sex scene in his low budget film Brown Bunny. Gallo's co-star - and ex-girlfriend - Chloe Sevigny performs oral sex on him during the shocking shot. Both insisted when the film was released in 2003 that the sex act was for real. But New York Post reviewer Frank Scheck hinted a prosthetic had been used in a recent article. He described the penis as an "appendage that may or may not have belonged to her co-star and director, Vincent Gallo." Gallo immediately wrote a foul-mouthed reply to the newspaper, saying: "Tell that hack to convince his mother, sister or wife to let me give it to her... and then she can report back to little Frank if she thought (it was fake). "The Brown Bunny is an ultra-low-budget film. With that in mind, the expense to create a prosthetic that could pass on film would be well out of the film's budget, and so far no one has come close to making such a thing pass as real... "For example, Mark Wahlberg's rubber (penis) was far from realistic and was only seen for a few seconds. If one wasn't blinded by jealousy, it would be easy to tell (my) scene was real. Chloe Sevigny herself has publicly said the scene involved us performing real sex. "Why then does Scheck promote doubt about the scene's authentic nature? I speculate it's because Mr. Scheck most likely has a very small, ugly penis and needs to believe that only in make-believe does anyone have one like mine!"