This union occurs when the two poles of energy come together. When you put on the switch, there is light, because the wires of the switch are uniting. In the same way, in ajna chakra, when union takes place, the explosion also simultaneously occurs.
Then the energy created in ajna chakra moves up to sahasrara chakra. There Shiva and Shakti unite with each other, and when they unite, Shiva begins to dance. Perhaps you have seen a photo of Nataraja. That is the symbolic expression of the awakened Shiva.
When Shiva wakes up from his profound yoga nidra, then he begins to dance. I am not talking about a man, but a force. The awakening of that force in man is symbolised by the dance of Shiva in the form of Nataraja. Then Shakti and Shiva descend together through the same path to mooladhara. Both come down together to the mundane level, the gross plane. That is the path of the saints who come down and reach us from time to time.
If you happen to read the philosophy of Sri Aurobindo, you will understand about the awakening of energy and its union with Shiva, both of them dancing together and then coming down to our plane of existence. That is why in kriya yoga we have ascending and descending passages – arohan and awarohan.
Now, the role of women in the tantric tradition has been defined, but the position of women in the modern cultures is far from this. People all over the world are fighting with their own guilt and sin. If you wish to resurrect the pristine position of women today, then the whole attitude will have to be changed.
In fact, our social structure will have to be based on a new concept of religious realities, in which the role of woman in mankind’s spiritual evolution is fully understood and accepted. This is absolutely necessary for the emergence of a new society. And you will have to realise this very clearly, so that what you practise and teach is not a consequence of your own religious conflicts within.