During my fun in the saunas i had the opportunity to speak with some garotos and some local customers (i can speak a kind of average portuguese and i tend to be confused as a local too).
Sometime i read posts about people overpaying garotos...
I don't want to talk about the problems that people may have with their ego, but please...DO NOT OVERPAY GAROTOS, especially in saunas. This is not only to preserve the business which depends on the locals and their spending capacity (quite low because of the crysis), but also for your own personal safety.
1) Garotos are in saunas to work, following saunas rules and standards. If you overpay them, you will not get a better service. If you lowball them you will get a bad service. Pay the standard going rate, or make a deal but do not try to get a rate lower than R$100
2) Garotos see you as living Mastercards. Overpay them and the only thing you'll get is FAKE INTEREST. A guy will stay with you for money, because it's working...a guy will stay with you for free, because he really likes you. You are the ATM, they are your toys. Period.
3) Acting like a gringo in a sauna and overpaying garotos will just make you look ridiculous, and trust me...garotos talk about customers. It's quite funny to see tourists who can't speak a work of portuguese, smiling when garotos at the table are making jokes about him in portuguese. You'll also get some weird looks from locals if you act stupid. Remember that respect in Brazil is extremely important. They're very welcoming but keep your egos for yourself.
4) Outside saunas, if you wanna hang out with a GP from Grindr....do not give them the idea that you have money to waste (the GP will make this link in his mind: Overpay->TONS OF MONEY). You'll increase the risk of getting mugged or worse. Remember that outside saunas, you have to expect everything.