If Kampfer wants to come in here and overturn this I'm fine with it, but let me just go ahead and come in here. I think prostitution should definitely be legal in Nepleslia. Nepleslians do not hide their sexuality, and they don't lie about their desires or intentions towards one another sexually. Nepleslians banning such an important part of their social process just because money is suddenly involved seems incredibly short-sighted.
What I think would be illegal is sexual slavery. Pimping would probably be one of those sadly oft-unpunished crimes that is frequently used to embareass police chiefs and commissioners. Nepleslians value personal freedom, to a greater extent than Yamataians I think. While I think being forced into prostitution would probably be more evenly spread along the sexes instead of being a more traditional man-to-woman kind of thing because Nepleslian women are so frequently portrayed as being just as strong and barbaric as their male counterparts; I do think that weaker people will always be subjugated by the wicked and it's likely a sad facet of the underworld-- something that people living in crime-ridden impoverished areas would encounter, perhaps disdainfully, but not with any ability to prevent.