I remember the frustrations of seeing a very photogenic stranger in the street and being too shy to ask if I could photograph them. I learned that skill from a now departed friend who was a master of charm. Once you get past that nervousness, you find that most people enjoy being photographed and are happy to pose for you. The more relaxed you become at your art, the less "creepy" you appear, and the more people are happy to interact with you.

In the course of my travels, I have found huge variations in how people react to my asking. In Europe and the US, most people are relaxed about being photographed; in South East Asia, people love posing; in Arabic countries, people can get quite angry if you even suggest the idea; in some African countries, they love it while in others, they hate it. Read the room and accept the situation as you find it. But remember that there are always exceptions wherever you travel.

I have a few golden rules regarding photographing strangers

1. Always ask first - I have been shouted at for trying to sneak a shot. (Although sometimes the opportunity is too good to resist, and you can grab a quick one)
2. Always offer to send them a copy of their photograph, but never ask for their contact details: I simply hand out a business card, and it is up to them if they want to get in touch.
3. Always let them see the results on the back of the camera.
4. If they say no, then respect their wishes.