Katie, chain locks are easy as hell to undo. All it takes is a bent coat hanger and 5 seconds, if you're practiced. Trust me, if someone wants you to be a part of coitus interruptus, there's really very, very little you can do about it except go to their place or move most of the furniture against the door. Even the furniture, however, can be moved by a big enough crowd of merrymakers.
Good call on the shotties, though.
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Strewth
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