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Most garotos honor their agreement.  
However, once in a while, a garoto will lie and say that you agreed to a higher amount.  
Unless I already know the garoto, I carry a small napkin and then write the agreed amount on that napkin and show it to the garoto who acknowledges the amount and the agreement.  

i posted this in the other sites, i hope it helps for those newbies english speakers looking for hot brazilian guys in Sao Paulo, you can only go to Lacoa and you will have the best time. So, here is my step by step at the Sauna Espaco Lagoa:
Have you ever been to Thermas in BCN or Paragoyna in Zurich? Well, Espaco Lagoa Sauna is quite similar, complete with a bar for drinks and food .
You can use your cell phone; walk around with it The guys or garotos may have limited English skills, but you won't need to do much talking. I used Google Translate and some sign language when necessary. A guy willl ask for 150 to 200 Reales.
If you spot a garoto walking around fully clothed there chances are he isn't good for sex . I learned this the hard way when I encountered two hot guys, fully dressed. One didn't treated me well and the other one has a good hard on but he was a cold dish. While the hot ones will show what they have with no problem and some walkiing around with a big hard on, it can be a All you can eat feast of men,
It can be a bit overwhelming at times, but there  are way more delicious guys compared to other saunas i mentioned above. Only a few garotos are pushy, and I didn't entertain them. 
If you appreciate well-endowed guys you're in for a feast. Some garotos will surprise you with their humongous cocks . I went to Lacoa from 5 pm to late 9 pm, taking breaks because I could barely sit after some of the guys.
I typically offered 150 Reales, not to be cheap, but to gauge their reaction. Most likely, their reacted good or bad so it was a good filter,  The hotter ones might expect 200 Reales and if they treated you nicely when they went up to 200, go ahead and say yes.
Upon entering the Lagoa , they'll provide you with a locker key, two towels sealed in plastic bags (they're that good), and flip-flops. Head up one floor where you'll find a bar with tables, similar to Barcelona Thermas. After meeting with a guy, you'll go another floor up to another cashier who'll give you a private room. I can't recall the exact prices, but there's a basic option with a TV and a bed that can get quite warm. My favorite, costing 55 Reales, includes AC, TV with movies, and a private bathroom. Called suites
There's a third floor with more private rooms, starting from room number 13 and onwards. Additionally, there's a small bar, a small gym for the guys, and a TV room.
Just when you think you've had the best guy, a new garoto with an amazing body/cock will show up. I often wished I could split myself in two or more to savor all the succulent garotos. As in any sauna with gayforPay, the best garotos are in high demand, so if you find one, grab them. but they always will be busy and not hanging around for too long
While some gartotos may not meet your expectations, considering the price range of 150-200 Reales (roughly 30 to 40 American dollars), it's a great deal for a try and error. Sao Paulo boasts some of the hottest and nicest guys. i saw all types, mostly masculines, and by 6 /7 pm were a lot muscle guys, blonde black and in between 
Best of luck, and feel free to ask if you have any questions. I'm typing on my phone, so please forgive any typos. 😜
Tonight, I plan to visit one of the stripper bars, and I'll provide you all with a report on those places. I'm not a young guy, so the garotos at the sauna wore me out, if you catch my drift. 😆 I have to recuperate during the daytime. And if you're a expert/slutty bottom, like me, be prepared. Even the most experienced and voracious bottom will be exhausted by the end of the day. I wish I had some numbing cream to handle those real 9/10 inches. Of course, not all the guys are that well-endowed, but I'd say about half of them are.

Interesting. He must behave different with different people. I had a great experience with Esteban in NY. He responded right away to my text and was on time. He kissed and was rock hard. And I thought it was one of the biggest thickest dicks I've seen, and I've had sex with Eduardo from Brazil. Not as long as Eduardo by any means (probably 9") but the length and girth were amazing. I couldn't even get the whole thing in my mouth. As far as fucking, he does like to ram it in. I had to make him lay down and sit on it to keep him from ripping me open. He asked me before he came if it was ok to cum. It did not take long and he shot a big load. Then while I was jerking off he started jerking off again and came again! In like 3 minutes. And another big load.

I read the forum all the time but haven't posted much. I guess it does sound like a bad porn story or plug. I was just surprised by the negative review. He did cum quickly and wanted to ram it in but I had fun.