I've made many documentaries, but prostitution was the hardest in terms of gaining the trust of the people being filmed.

La Zona is such a closed area, a dangerous, outlaw area. My time in the Zona was a time outside of society, almost out of the real world. And the girls there had such a sense of irony and sarcasm. They were also really interested in my film. They'd be like, "Thank God we live in Mexico, because our kind of prostitution has a heart. We wouldn't want to sit behind a glass cage or be sold by our own mothers. We have free will."

I don't aestheticize anything. I don't even use lights. The working girls do one thing all day: They make themselves pretty. That's their job and their money. In a way, I had the best makeup artists, hairdressers, and art designers in the world.

Prostitution will always exist in every society, so I believe in a fair trade. Open the doors for women to earn their money without having pimps. The worst thing is to criminalize it, because then you open the doors for pimps, criminals, and trading.

Whenever a man enters the realm of prostitutes he's always regarded as a possible customer. If you enter as a woman, you're regarded as somebody who could be in the same place. Being a man brings the perspective of flirtation.

A young man in Bangladesh can't even hold hands with a young woman. Without marriage there is no kissing, no holding hands, no going anywhere. So young boys can only go to the brothels for sex before marriage.

The most important thing is to find people that you enjoy - friends that you enjoy playing music with.