Dear Andy, having your fingers crossed may have worked with other girls you've been with but with Emily the fingers-crossing technique is not as reliably seductive as you may think. She sees those little blue fingers (from the exertion and squeezing) as a bit of something you might do begging for a date. Jumping up and down while crossing your fingers doesn't usually help either.
Most of us on the board have tried your technique in Emily's actual presence and she always says the same thing to us, right there, on the spot, "Positive thinking doesn't really work with me, fellas (or 'blokes' sometimes). Go read Keirkegaard, or Schopenhauer, or Wittgenstein... it'll be the same as seeing my nipples." Often she adds something about it not being proper for God-fearing women not leading men into temptation (in the English sense!) to show too much.
English women have been not showing their nipples for centuries. Apparently English men get off on it.
Actually she goes to work each day, though, stark naked. Go figure.