^ Exactly like TinMan says. It's primarily, if anything at all, sites and locales with street activity in cities where non-adult or nonconsensual forms of true human trafficking are taking place. This site, or places like it, are NOT promoting human trafficking no matter who wants to try to paint it that way.
Even so the level of arrests for prostitution in general, across the entire spectrum, is essentially non-existent.
You can verify this yourself by looking it up on any major cities crime or incident report databases.