Wikipedia, an online encyclopedia for everything, lists red-light districts from around the world and combines them with short descriptions. Pretty neat to find a RLD at your next travel destination. They were used to be very conservative, but have changed to negative bias over the years. Even academics engage in sex work research, how else would they know places where adult entertainment takes place?

It's a legal profession to own and run red-light disctric establishments in many parts of the civilized world.