TO GO WITH AFP STORY BY JAN HENNOP Customers walk around the red-light-district windows in the 'wallen' red-light district of Amsterdam on November 15, 2012, the Netherlands. Twins Martine and Louise Fokkens, nicknamed the 'Queens of the wallen', are Amsterdam's oldest prostitutes, having worked for fifty years in the city's red-light-district, and they have wrote two books about their experiences. AFP PHOTO / Anoek de Groot (Photo credit should read ANOEK DE GROOT/AFP/Getty Images)
