Being from So Cal, I'm mostly a very casual guy and usually call people by the their first names or nicks (or some abbreviation of nicks), even in business situations, but this is about what we like to be called nto what we call others. Again, I'm fairly casual, my nick or some variation is fine. If in a relationship, Sir or Mr. ____ (last name) works in public for sub or slave, in private Sir (as Dom) or Master if it's a M/s relationship. Daddy might work in a role play, but I'd have to be fairly deep in the relationship (and the act) to permit "Oh, baby" *VBES*