When flirting, you should be on the lookout for signs of interest. If you see at least four of the following signs in the body language of the person you are with, it is likely that they are interested in you, and you are being given a green light to move things further!
1. Lengthy eye contact. Eye contact maintained over a period of four seconds or more is unusual between casual acquaintances or friends, but not amongst lovers; and it can be rather intimidating, but if you are flirting with someone and they know that you could be flirting with them, they are sending you an explicit message with the power of eye contact! This could also come from somebody who hates you, but that is unlikely from a stranger.
2. Mirroring. If your posture tends to be similar to that of the other person and tend to do what you do at about the same time that you do it, they are either consciously or unconsciously developing a rapport with you. You can test this by subtly changing one aspect of your posture (the position of an arm, for example) and noticing whether this change is reflected in the other person during the next minute.
3. Where the body and feet are pointing. If...