Mixed gene pool. Brazilians descend from native South Americans, Africans and Europeans so they get the best of everywhere, and mix it up. It is also a hot weather climate where people are more easygoing. And Brazil is a festive, effusive, right-brained culture. Life is lived outdoors and everything is done with exuberance, and that too is very attractive. Yes to your other question, if you are friendly and have and interesting story to you, then Brazilians women will take to you.