I rarely, if ever, really relax my guard completely; the nature of my guard just changes depending on how well I feel a person knows the "real me." My guard also tend to fluctuate towards the lowest common denominator in terms of my comfort level with all people present.

I can only think of a handful or so of people, including my family, around whom I am capable of relaxing completely, and even with them I don't always entirely allow myself to let it all hang out.