No problem! Brazilians are very helpful people, and women are very well respected. We don't want to deny the fact that many Brazilian men are machos, but they are non-offensive and friendly. Assaults to women are not more common than to men. Assaults in general happen where there is no police around, for example in big cities at night, close to slums (favelas), on public markets, inside the cheapest public busses etc. Either avoid these places or don't carry any valuables/documents with you then.