Indeed. Some may like compliments like "lindo bumbum brasileiro" (pretty Brazilian bum)...
(If anyone wants to try this make sure you pronounce bumbum as boomboom)
Brazilian portuguese...
lindo brasileiro would be for a male bum
Try something simpler like "linda!" (beautiful), much better.
boumboum is fine, a bit trendier than 'bunda'.
'Bonita' is a bit more prissy, pretty, but has the advantage of being the same in Spanish.
Quite a few 'Brazilian' p4ps in the UK don't seem to be Brazilian, but Brazilian sounds more exotic on their profile.
Don't forget a nice-to-be-nice 'obrigaaado' (thank you) as you wipe your dick on the curtains.
Hope that helps.