We have your kind of locks here in America-- at least, by my life's experience. It does sound weird to me to need a key to lock your own door. But what do I know? They probably have some kind of reason for it.
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Oh well, okay, some houses have those locks. Others still have latches on the outside as well as inside, which is ridiculous in my opinion because if you forget to lock the door at night then anyone can just walk in and rob/kill/rape you! My country seems to be rather confused when it comes to domestic security. :S
And apparently I'M confused about domestic security as well. When I say we don't lock our doors from inside, I mean we actually have locks AS WELL as a keyhole. I don't see much point in that extra keyhole though since most houses here in England have Yale locks for the resident to get in if they have a key, which isn't required if they want to get out. Needing a key to leave your house is just plain daft.
We have locks like Danish ones in the U.S. too. I don't think there's any door in this country that locks from the inside. The locks you're used to are called security bolts in the U.S., though, because we actually have two separate locks on our front doors: one on the doorknob, which keeps the doorknob from being turned, and the security bolt, which is in case you forget to lock the doorknob. Bad neighborhoods will sometimes have small chains that go across the door and hook into a fixture on the wall. That way, if you leave the first two unlocked for some stupid reason, it makes it harder for criminals to get in. Bad neighborhoods also have a metal mesh door on the outside of the normal door with the same two-lock system. We're really paranoid in American ghettos. It is perfectly normal for a house in a downtown urban area to have a minimum of five locks on two separate doors.
Do most of them have windows close to the doors? I have a door like that in my house but I was told it was because the house design had narrow windows bordering the doors so if you did not need a key a person could punch through the window to unlock the front entrance. With the door's design all that would give them is some nasty cuts and perhaps a dog bite before they would have to leave without getting inside.
We use keys and locks...go England! We're special! Omg, everything was just so simple and plain and then...Englad's face at the en. I'm dying of laughter. If I get an injury from too hard, I will sue! Lolz.