Brazil and prostitutes.

I notice when I read around alot on Rooshv forum,lots of guys are implying other guys (particularly black guys but not only them) are mainly either knowingly or unknowingly sleeping with "semi-pros". It seems like something everyone is aware of but I have no clue of, can someone shed some light on this? How do guys land semi pros over there, I seem to be missing something from that discussion likely because I don't travel there, are these guys look for hookers or are the just looking for easy pussy and just happen to end up with hookers? There are lots of innuendos around the subject but no one every comes out and says it straight and I can't find anyone being direct about it