An American man had to have the head of his penis cut off after wearing an erection boosting sex ring for an entire day.
Medics, who treated the 68-year-old, were forced to peel away layers of dead tissue in the horrific case but found the tip couldn't be saved and had to be removed.
However, in an apparent world first of its kind, medic used part of the man's thigh to rebuild parts of his penis.
The unnamed patient told doctors from the University of California's department of urology that he had worn the ring, which boosts an erection by trapping blood in the genitals for about 24 hours.
Being unable to remove it from his engorged member by hand, he then resorted to using pliers to pry it off.
But shockingly he only sought aid from medics a week later after experiencing problems urinating.
Documenting the surgery in the journal Urology Case Reports, medics said at the point of admission the man's penis was abnormally purple coloured with blistered skin in yellow patches.
The man, who was homeless, was initially discharged to a nursing facility after having a catheter inserted to help him urinate given his apparent lack of greater harm from his sexual escapade gone wrong.
However, two weeks later he returned after his entire penis had turned black and gangrenous.
This indicated the member had become necrotic, with the tissue itself having now died from having its blood supply cut off by the tight ring's extended attachment.