Traditionally, the left side was associated with love an commitment through the ages as that is the side in which the heart resides. This is followed with other ritualistic items as well, including fans and flowers. I am not well acquainted with the language of fans, but I do know that traditionally, a maiden who was available would wear a flower behind the right ear, while a matron or child too young would wear a flower behind the left, denoting their status as unavailable.