When we were on set with our Cybergirl of the Month for December 2010, we were stunned by her slim, petite figure. When we asked Brittany Barbour what was her secret to keeping her all-natural body so toned and fit, we were not prepared for her unorthodox answer. “Sex is the only exercise I get!” giggles the beautiful blonde. That is one workout regime Playboy fans are willing to try out several times a week.