Sometimes the presence of a camera is like opening a door, because many people want what Andy Warhol called "15 minutes of fame." But prostitutes don't want that.

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

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

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.

If you're a prostitute, this is your day: You party, you have customers until four or six in the morning, then you sleep. You wake at noon, watch soaps on TV, take two or three hours to fancy up yourself, and then you start waiting for customers. That's your life. And some days no customers come. There's no party. There's nothing. You sit there and wait. If you're educated you can read books, but in Bangladesh and most other places you watch TV or listen to music or cook.

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.

Mostly I take photographs in times of research. Whores' Glory was shot in 30 days, 10 days for each segment, but the research for each part lasted a couple of months.