The concept of Ardhanariswara shows us that man and woman union is the one which produces life in this world. There is a bit of male in woman and a bit of female in the man. When both come together, life gets created. Without the female Shakthi, the male Shiva does not do anything. It remains as it is. The power of Shiva starts working only in the presence of, in the union of Shakthi.