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A single Japanese man almost died from masturbating, according to a medical case report.
Doctors claimed the 51-year-old, who they didn't identify, enjoyed pleasuring himself several times a day.
But his habit nearly killed him on one occasion last year, after he suffered a stroke just moments after ejaculating.
The NHS says the stroke the man suffered can be triggered by having sex, coughing and even going to the toilet.
The man was instantly struck down with agonising 'thunderclap' headaches after he climaxed, and later began vomiting.
A CT scan (pictured) showed the man's brain bleed. The white material indicated by red arrows is fresh blood that should not be present. Those spaces should be filled by cerebrospinal fluid which looks like the blue arrow
The arrow points to the 51-year-old's aneurysm, which occurred at the base of the brain in the left internal carotid artery. The carotid arteries are the main blood vessels that supply the head and neck
Concerned about his sudden symptoms, he took himself to Nagoya City University Hospital.
Doctors noticed he had low blood pressure and was disorientated – which are two tell-tale signs of a stroke.
Medics carried out a CT scan on his brain, to find the root cause of his symptoms.
Results revealed he had endured a subarachnoid haemorrhage – a life-threatening type of stroke that was caused by a blood vessel in his brain rupturing.
The man survived his ordeal, and was discharged after nearly two weeks in hospital in an 'excellent' condition.
Dr Masahiro Oomura and colleagues, who published the case report, offered no explanation as to why he may have suffered a stroke from masturbating.
But the NHS says the brain bleeds can happen as a result of physical exertion, such as
