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I'm trying to find the name of an SF&F book I read a long time ago. One of the ideas in the book was that, as the world had been created by angels, it required a 'Book of Rules' to make the world work. One of the rules was 'All beautiful women shall dress scantily' (or similar); another was 'barbarians shall dress in loincloths' (or similar). One of the lead characters was a barbarian who had previously been a trucker here on Earth who dies (or was dying) in a crash.