**This claim is true, according to a NGO dedicated to the conservation of Bornean Orangutans.**
The Orangutan, named Pony, was shaved every day and used as a prostitute in a village located in Indonesian Borneo. Policemen rescued her in 2003 and she was put under the care of the Borneo Orangutan Survival Foundation (BOSF).
The BOSF confirms it on their website and Michelle Desilets, BOSF director, talks about it in a Vice interview and on her Twitter.