For her to state this on a first date hints that she is a bit socially inept or spoiled. In addition she is either trying to brush you off politely or is just into tests and playing games. None of the above are traits you should be looking for in a longterm GF. While you could have gone through the motions to see if she was the right girl, you probably saved yourself some grief, and maybe avoided a good case of blueballs or cheating.
Maybe you could have won her over with your fat wallet and manly charms, but you're probably better of without that type of girl. You blowing her off probably did her some good too.
Relationship advice on an escort forum - there is probably a few jokes about that...