An orangutan was chained to a bed, shaved daily and forced to have sex with men for years.
The animal, named Pony, was captured and “treated as a prostitute” by her kidnapper, who pimped her out to clients.
The sickening abuse carried on for years before she was finally freed.
Rescuers discovered Pony’s body had been shaved and she was covered in painful bites.
She had been chained to a bed and raped repeatedly.
The Borneo Orangutan Survival Foundation said: “Unthinkably, Pony was herself treated as a prostitute.
“Men could pay a certain amount of money to the house owner to have sex with her.”
It is thought Pony was just six years old when she was rescued and it is not known exactly how long she had been at the ‘brothel’.
The BOSF’s statement continued: “The house owner strongly refused to give up Pony. To her, Pony was a cash machine and a source of luck.”
It took the intervention of police and military officers to persuade the homeowner to allow the orangutan to leave.
During her ordeal, Pony was made to perform sex acts on men and it has taken more than a decade to rehabilitate her.
She was brought to the Nyaru Menteng centre in Borneo, Indonesia, where workers were alarmed at the damage done to her.
Pony showed no desire to explore and was not able to forage for food herself.
Volunteer Michelle Desilets told Sun Online: “It was horrifying. She was a sex slave – it was grotesque.
“She must have been in so much pain.”
The orangutan was rescued in 2003.
During her rehabilitation, men were not allowed near her, as she was obviously traumatised by the cruel treatment she had endured.
It is only after 15 years that she is finally in good health and able to forage for food at the Nyaru Menteng Rehabilitation Centre, where she is in an enclosure with seven other orangutans.