You've got ATM in every shopping mall. To avoid the extra charge you could pay with debit card.-
You should try Recoleta at night, ask at your hotel about pub's area in Recoleta neighborhood. Most places are mixed now, gay & straight, although you can find some gay places. I recommend a restaurant in Palermo, Pepo Pepona. You can find some strippers there, and may be they work as escorts too, I don't know.
If you are planning to go to Contramano, I think Sunday is the best night, definitely not Friday.