I answer the door even less than I answer the phone, which is to say, never. Maybe I'd like to set up one of those sweet "air lock" systems.

Beyond general anxiety of interacting with people, if they are in my home... it feels dirty and invaded. If someone comes into my *room*, it just feels like an invasion that I can't scrub away. This is like sacred territory that I feel safe in. If someone else trespasses, it has to be cleaned again before I can feel secure.