Why do all Brazilian women go naked in the streets in the carnivals?

Because Brazilian society is very open-minded about the body.

They are a people that like to enjoy life.

Men and women like to see other good -looking men and women.

If they are good looking, they feel good about showing it to others, and enjoy it.

If they don't have good bodies, they try to improve them, and they feel proud of how they look no matter how they look.

In contrast, the US is a very bitter and moralist society.

People love to tell others what they should do or not, wear or not.

Women hate that other women display beauty they don't have, and men hate that other men have bigger equipment. That explains the ugly, diaper-like bathing suits common in the US for women and the long-baggy shorts men wear. People use them to cover themselves and their shortcomings.

Because they have such great a$$es

It's their culture

Those are performers and aren't demonstrative of "all" Brazilian women (in fact these performers often aren't women at all).

Because they want attention

I wish they'd do that in the US. I rather enjoy watching nude women dance and shake.

I'll answer your question just as soon as you convincingly explain why you're posting anonymously if you're not a troll. If you ARE trolling, please don't respond.

"ALL" Brazilian women ? That's a lot.

it's a cultural thing

Why not? There's nothing wrong with that.