Some very practical points
- be prepared with all items she and you may need IE condoms, mouthwash etc
- take the pressure off her and you by discussing expectations beforehand
- this could be great if everyone loses their inhibitions and goes for it however
- if things do not go well have an agreed upon exit IE watch a movie, call a cab etc
- Sex with someone gets better as you learn about each other's desires and feel safe discussing them but this is your big chance to be frank and free about your desires and just go for it
- take a photo of the guy and photo some ID and send it to a friend then tell him what you did
I Love Sexplanations (the female in the OP). A real female sex expert giving real uninhibited practical advice about sex that you can learn from.