http://www.livescience.com/17018-empathy-genetics-behavior.html "The gene in question is the "love hormone," or oxytocin, receptor. A single change in the receptor can result in higher or lower empathy, or how much you can emotionally relate to others. These changes can be detected by strangers from just 20 seconds of soundless video; these strangers could literally see the person's genes manifesting in their behavior" so if there is a sucker gene they really can "see you coming from a mile away"... heh heh
