Current Perspective in Brasilia
As a Brazilian citizen living in Brasilia, I feel myself comfortable to give some useful information about what is going on. In downtown you can find women at night on the sidewalks close to most of the hotels of the Asa Sul Region. If you are in the Asa Norte side, there will be any of them. Almost all good bars for this use are closed, but in the Star Night you can find good stuff ([url]http://www.starnightboite.com.br/[/url]). But the prices would be muche higher, specially for foreigners.
The websites mentioned before are still a very good option. But there is no guarantee that the lady will speak something else then portuguese. But they are criative and can handle the situation.