A 31-stone plane passenger forced cabin crew to strip him in a cramped loo and wipe his bum while he MOANED with pleasure.

The disgusting incident allegedly occurred on an EVA Air long-haul flight from Los Angeles to Taiwan’s Taoyuan Airport.

4 The passenger was alleged to have made crew aboard the EVA Air flight undress him in a plane loo

A flight attendant, whose surname is Kuo and was chief purser on the flight, alleged the unidentified man made her and her colleagues undress him in a lavatory and wipe his backside on January 19.

During a press conference, the stewardess explained the series of events leading to the crew having to pull down the passenger’s pants and clean his bottom after he had finished relieving himself.

Kuo said the man, who she estimated weighed 200kg (440 lbs or 31.4 stone), boarded the plane on a wheelchair and asked to be given three adjoining seats in economy class due to his size.

As the flight was not full, he was granted his request.

But this later allegedly escalated to a demand to use the plane’s business class lavatory, as he could not fit in the economy-size cubicle.

She said the passenger claimed an injury to his right hand prevented him from fully undressing himself in order to use the toilet.

He therefore asked cabin crew to pull down his pants in order for him to successfully relieve himself.

I told him we couldn't help him but he started yelling. He threatened to relieve himself on the floor Kuo, chief purser

Kuo said: “I told him we couldn’t help him, but he started yelling.

"He told me to go in there immediately and threatened to relieve himself on the floor.

“As the passenger’s genitals were now exposed, one of my colleagues brought a blanket, which I used to cover his modesty.

"But he very angrily slapped my hand away, saying he didn’t want it and only wanted me to remove his underwear so he could use the toilet.”

After granting the request, the crew was left further traumatised when the man called them into the cubicle again in order to wipe his bottom.

Kuo’s chief attendant reluctantly agreed, explaining that they did not want to leave the lone passenger trapped in the loo.

However, the flight attendants’ discomfort then turned to humiliation when he allegedly began moaning in apparent pleasure as the chief attendant wiped his backside while wearing three pairs of latex gloves.

Kuo, who was holding onto the passenger to keep him steady, recalled: “He said: ‘Oh, mmm, deeper, deeper,’ and then accused my chief attendant of not properly cleaning his backside, requesting that she do it again.”

She said the attendant repeated the action three times before leaving, at which point the passenger said: “You can pull my pants back up now.”

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EVA Air, which only employs female cabin crew, has said in a statement its staff are not obliged to accept demands from passengers - even those requiring special assistance.

However, the Taoyuan Flight Attendants' Union, which is representing Kuo and her colleagues, argue that the problem is systemic, stemming from a service industry culture that frowns upon those who do not meet the customer’s every demand.

The union has suggested two solutions: ban the passenger and others like him, and begin hiring male cabin staff.

Further statements from the airlines and the union are expected in the coming days.

The Sun Online is unable to contact the passenger for comment on the allegations.

4 The EVA Air flight attendant giving a speech at the press conference Credit: AsiaWire

4 EVA Air, which only employs female cabin crew, has said in a statement its staff are not obliged to accept demands from passengers Credit: AsiaWire