[Nyororin]

I don`t really think it`s common in Japan. I can`t say that I`ve even heard about it - and although there are tons of sites offering to hook you up with a phone friend... The ultimate goal is to meet up with them for real life action, not sexual talk.

In my experience and observances, people in Japan seem a lot less embarrassed about actually doing the act than talking about it. I would say this includes photographing bits and pieces.

For as mainstream as camera phones are, I have to say that I think "sexting" is fairly uncommon.