It's 9 p.m. on a Wednesday, and the night shift has started work at Langtrees, a popular brothel in the Western Australia city of Perth.
Like other women at Langtrees, "Ruby," 25, uses a working name out of concern for her safety. Ruby is from Spain, and tonight she expects to earn at least $1,500.
"I work in many countries — in Europe, in Dubai, I work in Brazil," Ruby says.