You should send a, "You know, I think I'll reconsider your offer."  Have "her" send you a pic, refuse to send her one of yourself (if she complains, simply pull a, "do you want the phone or not?") and agree to meet at a fast food joint.  She won't know who you are, so just wait around and see if a hot chick shows up.  Then, should you decide not to fuck her, leave the fast food joint without saying anything.