Book covers are like that too =D Especially fantasy novels. Can't think how many fantasy books i've read with a hot chick on the cover that had absolutely no relation to the book whatsoever.
Yeah- lol XD Sex sells though- it's a sad truth. In a world where advertisers work on formulas that work rather than accurate advertisements, it's pretty disillusioning to get an average product that you thought was going to be all shinny and change your life.