Not sure if clematis come in male/female varieties. However, they do need their roots in shade (other surrounding plants or gravel/pebbles etc) and the rest of the plant in sun. Check with local garden centre, or in a book in the library or a bookshop on your specific variety - it may take a year or two to become established. Also check what, and how often you are feeding it: apparently, plants get very lazy about flowering if they are too pampered, or you may be giving it the wrong sort of food.