The New York Times reports rape on transit vans in Rio de Janeiro. This echoes similar crimes happening in India. Ugly stuff, anywhere it occurs.
An insight about the affluent areas of Rio, there are a lot of stunning women walking around wearing a bikini top, tight hip-hugger jeans, and high heel shoes. The climate is hot and humid, the outfit makes sense climate-wise and looks great, but it does leave an extreme amount of attractive young woman on bare display. No excuse of course, but I'm just sayin,' there it is, maybe a factor.