It is true about second glance,but that can be done on purpose and not be sincere also,now playing with hair or tucking them behind ear,touching them are more unintentional gestures,signifying interest and sometimes insecurity. But there are many women who successfully control their emotions. So, in real life it is tough, in depersonalzsed world of computers it is tougher.Go for real life where you can judge by their body language