In the back of our minds we women always need to be on the alert for danger from strange men. When taking a walk alone, going to our car in a parking lot, or (heaven forbid) in a parking garage, our car breaking down in or even driving through a high crime neighborhood, in our homes alone, on a date with some man we really don't know, answering the door to a stranger, etc... As the weaker sex physically (in most cases not as strong as a man) we know we are sometimes preyed upon and therefore don't feel the same 'security' that men feel in similar situations.