The unnamed year-old turned up at hospital covered in red lacerations and bruises across his bum and thighs after being hit more than 1, times with a wooden cane and whip.
He told doctors at the Klinikum Stuttgart Hospital in Germany that the BDSM session lasted 30 minutes, and that he was struck while being tied down to a wooden bench. Medics believe blunt force trauma to his kidneys and a surge of creatine in his bloodstream caused his symptoms, according to the British Medical Journal case report.
The day after his fetish session, the man, who enjoys BDSM on a regular basis, noticed he couldn't pee at all. The patient, who consented to share his experience, said: "I have been engaging in bondage and discipline, dominance and submission, sadism and masochism BDSM for some seven years now.
There, medics warned him if the damage to his kidneys was that bad he might have to be put on dialysis - which filters the blood in the place of the kidneys. I had been aware all the time that BDSM can be harmful but this event convinced me to reduce the intensity with which I do it. Doctors told the man they believe the force of the spanks caused a build up of tension in his muscles. Creatine is then filtered from the blood by the kidneys, and peed out in the urine as a waste product.
Doctors also believe abdominal compartment syndrome - caused by too much pressure on the man's tummy - could have played a role in his symptoms. The doctors noted he had been strapped down "very firmly with the ropes cutting into his back and thighs and his organs being squeezed against the wooden bench". After four days his kidneys "spontaneously" began to produce normal amounts of urine again - and his creatine levels returned to normal.
