1)You get on first.
2)She does not get on or off till you say so.
3)She keeps her feet on the pegs at all times, including stops.
4)Her arms go around your waist and hands on the tank.
5)She is never, ever to hold on to your shoulders or arms.
6)She is to try to stay loose and relaxed and not try to "fix" the bikes lean angle.
7)She should keep the center of her torso (heart area) more or less lined up with yours.
8) She should not make sudden movements, they can upset your balance.
9)She gets to make the decisions about anything that seems scary.
9.1)Decide on a signal that means I'm uncomfortable with this" and if she gives it to you, stop doing that.
9.2)Decide on a signal that means "pull over" on d pull over if she gives you that signal.
10) Your job is to make sure she has a good time, not to scare her or impress her with the power of the bike or your riding skills.
11)Before riding, expalin anything about the operation of the bike and how it works that is relevant, especially how turns, lean angle and traction work.
12) You start out as if you are learning to ride all over again, things can be different with a passanger, especially if she does anything unexpected.
There is probably more but that's all i can think of off-hand.