[Grey]

Also I think you correctly sensed that her refusal to let you pay was a warning sign. She didn't want to feel like she owed you anything. In fact she really didn't want to feel like she owed you anything. Women know in the first 10 seconds if they'd [censored] you or not, and this girl did not want to [censored] you. Trying to change a girl's mind on that matter is never worth the effort. You should have been expecting to get shot down at the beginning of the date. But you're a clever and pretty good-looking guy, so don't let one girl's whims hold you back.

I think the only sure-fire way to increase the likelihood these girls decide to [censored] you (in that 10-second span) is to act self-confident. You need to look presentable too, but really I think it's that simple.