Security? we've heard of it
One of the things I like about living hereabouts is that dinner parties are usually potluck - you each bring a course. After the dinner the hosts wash up, and you pop around to the house over the next few days and root around in the kitchen until you find the plates you brought the food on - whether the host is home is not really relevant.
Likewise when my wife was visiting family I would discover pre-cooked meals waiting for me in the kitchen, because the neighbours were (unnecessarily) worried about me starving while she was gone.
You do need to close doors though. Another friend looked over her sofa and discovered a bear dragging out the trash bag from the kitchen, and not that long ago a woman hereabouts was attacked by a cougar while watching TV. (Oh, and in British Columbia, Canadian milk comes in plastic bottles, as nature intended.)