A man accused of rape in Canada could not have committed the crime because he is too obese and his penis is too small, according to his lawyer.

Career criminal Jacques Rouschop, aka 'Porkchop', is accused of choking and raping two sex workers in Vanier, Ottawa, in 2013.

After passing round nude pictures of her nude client for the jury to inspect, lawyer Natasha Calvinho said that his hernia, small penis size and obesity mean he was unable to commit the crime, reported the Ottawa Sun.

Rouschop's hernia "makes it too painful to have sex from behind, his stomach is too large and his penis is way, way too small," Calvinho told the Ottawa court on Thursday.

A nurse who testified at the trial said that Rouschop is 5'6" tall, and his weight exceeded the 320lbs the prison scales were capable of recording. His waist is 66 inches, but his penis is only one inch, two when erect, said the nurse.

Calvinho argued that though Rouschop hired sex workers, he did not abuse them.

"Due to his weight and his appearance, he will be the first to tell you that he has had a lot of trouble attracting members of the opposite sex, and that getting a woman's attention, let alone having sex, was not something that happened very often for him," Calvinho said.

Both woman allege that they were chocked until they blacked out in the back of Rouschop's pickup truck. Rouschop has pleaded not guilty to the charges. The lawyer also told the jury it is Rouschop's belief that he is the subject of a "witch-hunt" and that Ottawa detectives investigating the unsolved 2013 killing of sex trade worker Amy Paul targeted him because they suspected he killed her.