In reply to eucinpyos:
Its interesting,there is so much being written here that all makes sence from various angles. As a photographer I spend a lot of time watching and listening to people and observing with out a camera, as well as with.
I never try to take candid pictures and always try to ask, how ever on a few occasions I have seen teenagers taking close up candid pictures of girls or women on the water front near where I live, on one occassion L heard the lad say to his friend after taking an ariel shot of a woman in her forties topless, I want to show me mates her saggy tits. he was shooting on his mobile phone.
Another time this year a younger guy was photographing french girls in bakinis and going in close up of the croch of one of them, again with a mobile phone cam
I told him I think that you had better ask first mate, he then shouted to me you grass I would not get the picture if I do that.
The point I think that I am getting at its very hard with the new digital technology to control candid picture taking, and every day we are being filmed in anycase if we walk through City centres.
I would not like people photographing me without first asking.
I would then jump up and Vogue do sumersaults if thats what they wanted, but it rude not to ask.