This opens up an interesting can of worms. For one in a social setting after some time the chemistry heats up between certain individuals. Some girls especially, act aloof but these will be the first ones to show a sexual interest. Their aloofness is hiding the sex thing. I believe it's an ego defense mechanism-maybe reaction formation. Sometimes all you gotta do is say hello and then watch the walls break down. So..the more aloof she is the more she finds you interesting. In another direction I'm very suspicious of someone who is overly friendly as in time you will see them turn on you. Again the ego is hiding it's true feelings protecting the person from what it sees as unacceptable. It's happened too many times to not be true.