RE: Instructors dating students: I just have to say no, no, no. The dojo is a place for Aikido practice, not a cruise bar! It is not fair to students to have to deal with an added love element. I may just be a scrinchy old lady, but pleeaase- there are so many other places to meet people- the park, grocery, church, etc, etc.
Practically speaking- if a date goes belly up- (say the student was much cuter in a gi than in regular clothes), usually it is the student that leaves the school, not the instructor. Its hard to keep students.
Instructors dating students- its a bad dynamic all the way around.