Along the street, every little window is filled with a bikini-clad woman, a licensed sex worker, authorized by the Queen of the Netherlands. Some are good looking, some are not, all colors, all shapes and sizes, and sometimes they pose provocatively or sway to the music. When you smile at her, she also reveals a smiling face, but more expression is a kind of stare, perhaps they face this kind of eyes of tourists have long been accustomed to. They are behind the fluorescent-lit glass doors and windows to solicit customers, and if the tourists look at a certain woman, want to further "communicate" with them, the curtains of the window will be pulled closed.