Dad-of-five Fan Lung, 32, reportedly had used wife Feng's phone to send his 21-year-old lover a saucy email.
But he forgot to log out of his account when he returned it to his spouse - with dire consequences.
After reading through her husband's messages to his mistress, 30-year-old Feng is said to have flown into a rage.
"Then we discovered she had chopped his penis off again"
Grabbing a pair of scissors, she reportedly stormed into their bedroom where he was sleeping, and snipped off his penis.
Fan was rushed to hospital, where the organ was successfully reattached - but Feng wasn't done with him.
She allegedly sneaked into Fan's hospital room and cut off his penis for a second time.
And, this time around, she threw it out of the window.
A hospital spokesman said: "The first we were aware of what happened was when someone came into the reception area to say a naked man was beating up a woman outside the hospital.
"Staff rushed out to see what was happening and found the patient with blood streaming down his legs hitting the woman.
"He was stopped and the woman was taken in for treatment, and then we discovered she had chopped his penis off again."
Despite searching the area, police and doctors were unable to find the man's missing penis.
They believe it may have been taken by a stray dog.
The hospital spokesman added: "The man had lost a lot of blood and was taken in for emergency surgery.
"He is now in a stable condition but is extremely emotionally distraught."
Despite his missing member, the man's mistress has reportedly vowed to stand by Fan and marry him as soon as possible.
Feng, meanwhile, has been arrested for grievous bodily harm.