I have seriously considered Rio --------- but when I searched for hotels anything decent was in the £100 a night bracket, that is beyond what I am willing to pay.
I was just thinking of you as I posted that Jimmy and although we don't know each other well my guess is you might prefer Buenos Aires (Argentina) for many reasons, It is like chalk and cheese from Brasil & Rio, but accommodation is reasonably priced and the system is recognisable (ie both hotels and prostitution venues). Longer flight than BKK but you can more or less relax when you get there - whereas Rio will either take 10 days to learn the ropes and decide if you like it and that could be an extremely expensive ten days. ISG has a separate Argentina forum that is conducted in a strict gentlemanly fashion, but complete with maps, ratings, how to buy V at the same price as smarties, and you can pick up a hotel in the centre of town on Agoda.com without having to wade through all the double-dealing rules that are part and parcel of Rio. Rio has every size, shape, colour of woman imaginable but it is an intense environment and the city is the size and complexity of London. The sense of humour, the emotional sophistication of the women, the music and dancing - there's no place like it - but an easy ride it ain't. Whereas Argentina you just walk in, go to a decent class brothel (say, half or a quarter the price of HD including free drink and luxury rooms) and take your pick. There's a few rip-off joints yes, and a few cheap-n-cheerful places too if you want to rummage about, but you can almost believe you are in Europe at times. A large proportion of women have a European appearance (body shapes and white skin) and the better madams can indicate ladies that speak passing English.