All of this in sheer nonsense: first of all, many women use these behaviors to non-romantic purposes, and even if there is romantic or sexual aspects in their behaviors, they could just be testing if your interested, in which case you are being used to flatter their own egos. Secondly, many women will, for whatever reason, not use such non-verbal signs, even when they actually are interested in you. You will, in particular, miss the non-verbal language of your dual!