Not all prostitutes have a boss; some get business through an escort agency, which is a business or person the prostitute pays to advertise for them and get clients for them. Many prostitutes just work for themselves. The city of Amsterdam is famous for its prostitutes in the Red-light district (a part of a city where prostitution is common). In the Red-light district, some of the prostitutes sit in windows to show that they are available for business. Some people think that in the future, human prostitutes will lose their jobs to sexbots.