If you remain alert you will see: first, changes of energy in the body; second, dropping of the thoughts from the mind; and third, dropping of the ego from the heart.
These three things have to be observed, watched carefully. And when the third has happened sex energy has become meditative energy. Now you are no longer in sex. You may be lying with your beloved, bodies together, but you are no more there — you are transplanted into a new world.
This is what Shiva goes on talking about in VIGYAN BHAIRAV TANTRA and in other tantra books. He goes on talking about this phenomenon: you are transmuted, a mutation has happened. This will happen through witnessing.
If you follow suppression, you can become so-called human beings — bogus, superficial, hollow within; just dummies, not authentic, not real. If you don't follow suppression but follow indulgence, you will become like an animal — beautiful, more beautiful than so-called civilized man, but just animals — not alert, not aware, not conscious of the possibility of growth, of the human potential.
If you transform the energy, then you become divine. And remember, when I say divine, both things are implied in it. The wild animal with its total beauty of being is there. That wild animal is not rejected and denied. He is there — richer, because he is more alert. So all the wildness is there and the beauty of it. And all that civilization has been trying to force is there, but spontaneous, not forced. Once the energy is transformed, nature and god meet in you — nature with its beauty, god with total grace.
This is what a sage means. A sage means a meeting of nature and the divine, a meeting of the created and the creator, a meeting of body and soul, a meeting of that which is below and of that which is above, a meeting of the earth and the sky.
Says Lao Tzu: Tao happens when earth and heaven meet. This is the meeting.
OSHO
from : My Way: The Way of the White Clouds Chapter #6