If it's her "first time" as well
what might help is giving her a glass of wine before you go out, it'll help her relax a bit.
Otherwise, just keep it smooth, a bit like riding in the wet, easy on the throttle and the brakes, give yourself a little more time everywhere.... then when there's a small crest in the road, progressive use of the throttle in 2nd or 3rd gear will loft a nice controllable wheelie - pillions are really useful for this actually [smiley=thumbsup.gif] 8-) this suggestion is purely optional, the rest is pretty mandatory for a virgin pillion...
If you do a good enough job of it, she'll get off the back all happy and excited and jabbering about how she never knew it could be so much fun and when can she have another go and maybe she'll get one of her own 8-). If you make a real hash of it, however, she's likely to get off, wait until you've removed your helmet, and punch you really hard, and stomp off, never to be seen again.... :'(
The choice is yours....
Suggestion from Star, who's looking over my shoulder as I write - for your first trip with a passenger, why not take out someone who's an experienced pillion? That way they can give you some proper feedback (and maybe punch you as well if you really f*ck it up!)