Most of the guys favor a non-escort scene once they leave "work" in the evenings! They may go to a club/bar venue but there is no hustler bars per sei in Rio(or most of the rest of the world)!
Saying that you can get lucky at one of the gay bars like ToNemAi, where i have on 3 occassions picked up guys, but i was by myself and i am sure that is why i was noticed! Its my impression that even the gay sauna boys dont nexessarily hang around gay benues on their off times. I base this on my FB where about 80 or so of my "friends" are past or present sauna guys and where they post photos of where they were the previous night! Most times it is a party/Club/bar that you wouldn't classify as gay.
I know the guys that i have stay at the apartment with me when i am there do not go with me to the saunas in the evening. but will meet me back at the apartment to go to dinner when i get back after 9:30 - 10:00 pm! They all seem to hate going there if they are not wotking and this is regardless whether we are talking Rio, Sao Paulo or Porto Alegre! But they will go to a gay bar OCCASIONALLY, but not every night! And these guys are gay!