A sleeping man had his willy cut off by his girlfriend who then flushed it down the toilet because she suspected he had been cheating on her.

The victim, identified only by the surname Huang, 52, said he had fallen into a deep sleep after eating a bowl of chicken noodles soaked in wine at his home in Changhua County’s Xihu Township in Taiwan.

He said he woke up in incredible pain in his lower region to find that 20 per cent of the end of his penis had been severed, and his girlfriend had apparently flushed it down the toilet to stop it being reattached.

She then went to the police station to turn herself in while police and paramedics attended to the man and also discovered that the missing member was no longer anywhere to be found.

They did recover a large pair of bloodstained scissors that were found dropped just outside the house.

A fire brigade spokesman told local media that the injured man “could still walk on his own although he was bleeding extensively”.

Police have confirmed that they suspect the 40-year-old girlfriend, who was identified by the surname Phung and who originally came from Vietnam, may have spiked his food and are investigating.

The couple had apparently moved in together around 10 months ago and the woman had obtained Taiwanese citizenship by marrying a local man and later divorcing him.

The injured man was taken by ambulance to Changhua Christian Hospital where medics said that they had to operate in order to stem the bleeding and confirm that 1.5 centimetres (0.59 inches) had been chopped off from the end of his member. They said that his scrotum and testicles were still intact.

The woman meanwhile said that she acted on impulse, and has apologised saying that she regrets it now.

She faces charges of aggravated assault.

Her boyfriend has been told that he will no longer be able to have sex and is being given advice on having an artificial implant and reconstructive surgery. He is also being offered psychological counselling.