Women, as soon as you approach they know, its like the prickling sensation a gambler gets as the big roulette wheel spins round, there can be as much value in the blink off an eye as there can be in months of analysis, they don't know why they know they just do.

The ability to come to lightning quick conclusions evolved for the sake of survival in life threatening situations, humans needed to make accurate snap judgments and they needed to make them fast.

Our brain has evolved to think whilst on the go and when under pressure, to make an instant judgment we cannot consult our conscious mind so the unconscious will sift through our past associations in less than a second and give the host a quick yes or no and stay with that assumption until proven otherwise.

If the girl your about to chatup was beaten by her stepfather who always wore a red baseball cap and had sex with the family poodle and you approach sporting a red baseball cap her mind will automatically switch to flight mode (unless she likes bdsm and bestiality)

Though you can never predict what bad associations a girl has had it is quite easy to avoid the ones she's probably had and what that split second unconscious judgment will make. like...
most cases her first boyfriend towards the end of the relationship and for some weeks after would off created neediness and it would of imprinted those memories as bad signs to look out for when getting approached.

This is not food for thought, the last thing you want to do is go out and be in your head wondering what bad associations a girl has had before you approach but simply shows the importance of being indifferent to the average Joe,

If you remain indifferent in your character,approach,style then that split second decision will have no bad associations giving her that prickling sensation as a new exciting adventure is about to unfold and give you a much better chance of letting her reading a few chapters of the book before judging the cover.