As a Sagittarius born on December 5th, your assertiveness is matched by an equally restless and open nature. While others may shy away from expressing their true desires and feelings, you rarely have this problem. You will quickly let others know what you want and will work tireless let to achieve the goals you have set. You take the assertiveness into your interests, which have developed to be quite varied. In all aspects of life, you value honestly, which explains for the openness you share in your close relationships.