On my Fire 6 you can have more than one profile. I'm currently using hubby's account but can switch back and forth between the two with just two clicks. This is different than sharing a library. Hubby would freak if I did that with all the romances I own. You can set it up in settings. This only works on newer Fires from 2014 and up.
http://www.amazon.com/gp/help/custom...deId=201540710
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