Re: Who to call "Sensei"?
I usually don't care what people call me when I'm teaching. I've had a few people call me Sir, sensei, professor, etc. If someone asks I always tell them to call me Don or Hey (as in "Hey! I don't get what you are saying!")
It just makes me feel old to get called sensei or professor (I teach computer courses at a college part time). I've been told that I should really make the people training judo with me call me sensei, but I don't feel it is appropriate as I am not yet a black belt (soon however...mwahahaha). The black belt I am teaching under also does not enforce the sensei rule. We usually call him Jon or "that jerk who just gave me a world of pain".