If you watch nature shows with animals and stuff it is fascinating to see the mating games certain animals do. Most of the time it is the male that has to perform some task before he is allowed the alpha male role to mate. Sometimes they have to slay another animal, or square off with another male, or perform a ritual. Maybe women have similar standards? Ive never played hard to get, but I certainly see the value in not just placing yourself in the way of a male to his satisfaction. Women like to suss out a guy, see how he handles stuff and mayble to show he is strong enough for us. I know there are also women out there that do that whole ego trip to see how many guys will drool over them and run after them. Im thinking more along the lines of assessing a guy for his potential to provide and be a protector and good father material for future children. I think this comes through thousands of years of women looking out for their future children. I have heard too that men will check out women and make sure they look healthy and have a good enough body to bear children. Most of this is subconscious too, but it must be some form of built in instinct.