I don't (ok, rarely)open the door if I am not expecting anyone. Nothing to do with fear, but I have little tolerance for unsolicited callers. Friends/family know to always call me to arrange beforehand, so I figure any other callers are likely to be those I don't want to deal with-salespeople, JW's etc. My DH thinks I am weird, but I have always been like it. My home is my haven and I seriously resent any intrusions-however transient/minor.