From Warren Ellis: This Happened On Your Planet:

Pony is an orangutan from a prostitute village in Borneo. We found her chained to a wall, lying on a mattress. She had been shaved all over her body. If a man walked near her, she would turn herself around, present herself, and start gyrating and going through the motions. She was being used as a sex slave. She was probably about six or seven years old when we rescued her, but she had been held captive by a madam for a long time. The madam refused to give up the animal because everyone loved Pony and she was a big part of their income.

Pony was eventually liberated, but it required a large armed force because, apparently, people liked fucking a monkey.

Also, note the casual usage of the phrase “prostitute village.”