In every creation sex is used.
Tantra says that in your body is the whole cosmos in miniature: it is just a miniature of the whole cosmos. Do not fight with it. What is your sex if the body is a miniature? If really this is so, that your body is the whole cosmos in miniature, what is sex? That which is creation in the cosmos is sex in you. Throughout the whole cosmos, creation is going on every moment -- that is sex in you. And if there is so much force in it, it is because you are needed to be a creator.
If sex is so powerful, it only means for tantra that you cannot be allowed to be non-creative; you must create. If you cannot create something greater, then at least create life. If you cannot create anything better than you, then at least create someone who will replace you when you die. Sex is so forceful because the cosmos cannot allow you to be non-creative, and you are fighting with it. Use it.
There is no need to use sex only in reproduction. In every creation sex is used.
That is why a great poet, a great painter, may not feel so much of an urge for sex. But the reason is not that he is a saint. The reason is simply, that he is creating something greater and the need is fulfilled.
A great musician is creating music. No father can feel so much fulfilled as a musician feels when great music is created, and no son can give so much happiness to any parent as a great piece of music can give to the musician, or great poetry can give to the poet. Because he is creating on higher realms, nature relieves him of lower creation: the energy has moved higher. Tantra says, do not fight with the energy, allow the energy to move higher. And there are many realms of higher movement and many dimensions.
Buddha is neither a painter nor a musician nor a poet, but he has gone beyond sex. What has happened to him? The highest creation is the creation of oneself. The highest creation is the creation of total consciousness within, creation of a whole within, oneness. That is the peak, the Himalayan peak. Buddha is at that peak, he has created himself. When you move in sex, you create your body; the replica is created. When you move higher, you create spirit, you create soul. Or if you will allow me the expression, you create God.
-Osho, "Vigyan Bhairav Tantra, Vol 1, #26, Q1"