get_gender_by_email     Get Gender by Email
get_gender_by_email_bulk
                        Get Gender by Email (Bulk)
get_gender_by_name      Get Gender by Name
get_gender_by_name_bulk
                        Get Gender by Name (Bulk)
get_gender_by_username
                        Get Gender by Username
get_gender_by_username_bulk
                        Get Gender by Username (Bulk)
