sorry to burst your bubble...colour has nothing to do with it...in brazil big dicks come in all colours. As for the unlit areas just felt I had to point that out as Brazil is a very intoxicating place and its so easy to start off in a well lit area and then be lured into an unlit side alley. Great cheap sex is available in Brazil but its definitely not as easy or as safe as in Thailand.
In Sap Paulo there is a street called " Frei Caneca" commonly known as gay caneca. Its a very gay neighbourhood and its almost impossible to walk down the road withoiut getting cruised. Lots of cheap hotels in the neighbourhood. Shopping centre on same street is so cruisy that its almost impossible to actually take a piss in the toilets such is the level of activity in there.