Re: Hugging at the end on an interaction
Kino of any sorts is always recommended. Hugs are one of the best things you can do, and for you to just naturally do it is good. Some girls may react oddly because they are not expecting it, but the more they get to know you, the more they will warm up and return the favor to you.
I wouldn't really worry about cultural differences. Brazilians are very touchy and personal, while Americans aren't as much, but either way physical interaction is important. It doesn't matter which culture it is, it just matters that it's happening. I do agree though with Dave that confidence is key. If you aren't confident, people can smell that, and they won't react positively back.
"There is no better than adversity. Every defeat, every heartbreak, every loss, contains its own seed, its own lesson on how to improve your performance the next time." - Malcolm X