I learned about the issue at school, in economics, including law (like go see the doctor every two weeks, age of consent, which was 18 for females, 19 for males, hookers don't pay taxes, because government must not profit from lewd activity, not legal for teachers, lawyers, doctors, etc.) We also learned where the examination in the city took place and that the (large) cafe close to the place was always filled with professionals waiting for their turn. So I went there to check out them ladies what was surprisingly boring although you could tell who the more expensive ones were. Some hookers apparently knew that I knew. I was 15 or 16 in 9th grade. The economics teacher was female and a feminist/commie, but the matter was not her initiative, at least not alone, because there was a chapter on prostitution in the economics book. The trade served as an example of how economics is not a hard science and that government regulation is not a pure economics issue or something. (There was also a passage on global drug trade. I can't remember details, because I did not pay much attention at school and almost flunked eco that year. Had to take a test after the summer break for proving that I had caught up and did.)