I feel the need to comment that you must be deluded if you think that in "most cities in the world" , woman cannot walk around alone at night. And it is quite sad that you feel that way because it shows what you have been conditioned to. I live in a major city and feel totally unafraid to walk around at night alone, and neither does anyone else judging by the sounds of woman singing on their bikes, riding down the hill in front of my house at 3am on Saturday night in an inner city suburb. Neither did I feel unsafe in numerous other cities I have travelled to over many years. Granted I haven't travelled to Central of South America, or the United States, but I have travelled extensively. Please remember there is a whole world out there when you make such sweeping statements, and though it is a shame many places are dangerous and violent...not all places are quite so and it's wrong to assume that you have to be careful in any city. I do not live in a place where I have to fear for my safety at night, it is a simple as that.