Been dragged on one of those €39 "Red Light District Walking Tours" by well-meaning relatives. What a waste of money. Guide spent most of the time talking about things you can read on Wikipedia while walking past windows you can see for free.

The district is tiny. Takes 15 minutes to walk the whole thing. Just download a map and wander around yourself. You'll learn more people-watching and reading the historical plaques than listening to some guide recite rehearsed facts about prostitution laws.

Save your €39 and spend it on something worthwhile instead.