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You can find out more from here:  www.thehardnessfactor.comThis isn’t one of those books you’ll find in the back of certain magazines, along with those that promise that you will be guaranteed to incrase your size by 1″-3″.  This is a book by a real doctor on how to improve your ‘hardness’.I can’t say that I ever had a problem in this area, but using some of his ideas i did notice a noticeable difference (for the better!).How much would you like to have an approvement in this area?