When a woman first meets a man, the initial few minutes of her interaction with him are crucial and will determine the type of relationship that will ensue from then on. In simple terms: She will make all of her most important judgments about you within 3-5 minutes of meeting you.
During this ever-important window of time the woman will "appraise" your value, and then upon determining how much potential you have she will then decide if she wants to even continue to have any form of relationship with you at all. Once this is done, she will then place you into one of two categories within her mind to govern the type of relationship that she feels you to be worthy of: potential lover or potential friend.