The man who claims to have the world's largest penis has been accused of exaggerating its size with a doctor saying that it is actually only six inches long.

Robert Esquivel Cabrera, 54 from Mexico, cannot have sex because of the size of his manhood, which he claims is 18.9 inches.

But now radiologist Dr Jesus Pablo Gil Muro, who examined Mr Cabrera, said that the man refused to take off all of the bandages around his penis and wouldn't let the doctor see the skin, reports The Daily Mail.

Dr Muro told the Sun Online: "When he came here to do a CT scan, my first impression was that it was a unique and unusual case. I had never seen a patient like Roberto.

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"What the CT scan showed was that there is a very large foreskin. It goes just before the knee.

"But the penis itself is about 16 to 18cm from the pubis."

Dr Muro also claimed that Mr Cabrera was "obsessed" with his penis length, with the 54-year-old stretching his penis with weights.

Jonah Falcon, 47, from New York was the previous record holder. He is famed for having a 13.5-inch penis and accused Mr Cabrera of being a fraud.

He believes his challenger has been weighing his genitals down with weights and so the record shouldn't count.

Mr Cabrera has officially been registered as disabled.

He is receiving government handouts despite refusing to get a reduction because he hopes to find work in the American porn industry.

He said: "I cannot wear a uniform like anybody in the companies and also I cannot get on my knees.

"I cannot run fast and so the companies think badly of me. They say that they will call me, but they never do."

Mr Cabrera has been offered work in the adult entertainment industry by the man behind YouPorn and the FakeTaxi series.

Roberto Esquivel Cabrera claims to have the largest penis in the world but a radiologist has questioned whether it's true. Photo / Getty Images
Roberto Esquivel Cabrera claims to have the largest penis in the world but a radiologist has questioned whether it's true. Photo / Getty Images

He suggested Mr Cabrera could come to their studio in Prague to film a medical scene, though said it would be more comical than erotic.

Because he stretched his penis and doctors like Dr Muro say that his penis is actually only six inches long, the Guinness Book of Records refuses to recognise his "achievement".

Medics have urged Mr Cabrera to have a reduction so he will be able to function normally and have children, but he has refused.

"He'd rather have a penis bigger than the rest of the people," Dr Jesus David Salazar Gonzalez said.

"In Latin culture whoever has the bigger penis is more macho. It's something that makes him different to the rest of the people and makes him feels special."

Mr Cabrera added: "I am famous because I have the biggest penis in the world. I am happy with my penis, I know nobody has the size I have."

The sheer size of Mr Cabrera's penis causes him a number of health problems, including frequent urinary tract infections because not all his urine escapes his lengthy foreskin.

He keeps his colossal member wrapped in bandages to escape chaffing.

He is also unable to sleep chest down and has to put his penis on its own pillow to escape discomfort during the night.

And an active sex life is off limits for him as his penis has too much girth to have intercourse.

Mr Cabrera added: "Some people ask me if I put some condoms on it and the answer is: I cannot. I can never penetrate anyone because it is too thick."

While living in the US, he attempted to have sex twice, but the first woman backed out as soon as she saw his penis, and the other one had to stop because it was too painful.

The 54-year-old says he is unable to work because he can't wear a uniform and cannot get on his knees, meaning he is shunned by employers. Photo / Getty Images
The 54-year-old says he is unable to work because he can't wear a uniform and cannot get on his knees, meaning he is shunned by employers. Photo / Getty Images

However, there is a darker side to Mr Cabrera's past - while living in the US he was convicted on a string of indecency charges.

They include a felony assault charge for exposing himself to two underage girls, a conviction he appealed unsuccessfully.

He was forced to leave the US in 2001 but has now set his sights set on returning.

An adult entertainment company offered to pay for a reduction, but he refused and says his goal is to to meet the right woman.

Source: Jar-No

He added: "I am happy with my penis and I wish to go back to the US and spend the rest of my life over there.

"I don't feel sad because I know in the US there is a lot of women. One of them will be the right size for me.

"I would like to be a porn star and I think I would make a lot of money over there.

"And the people are not like over here, they are more liberal: they don't care about what I have in my pants."