When sex is just an unconscious, mechanical urge in you, it is wrong. Remember, sex is not wrong: the mechanicalness of it is wrong. If you can bring some light of intelligence into you sexuality, that light will transform it. It will not be sexuality any more -- it will be something totally different, so different that you don't have a word for it.
In the East we have a word for it, 'tantra'. In the West you don't have any word for it. When sex becomes joined together is yoked with intelligence, a totally new energy is created -- that energy is called Tantra.
The word 'tantra' means the capacity of expansion, that which goes on expanding. Sex shrinks you, Tantra expand you. It is the same energy, but it takes a turn. It is no longer selfish, no longer self-centered. It starts spreading -- it starts spreading to the whole existence. In sex, for a moment you can attain to the orgasm, and at a great cost. In Tantra you can live in the orgasm twenty-four hours a day, because your very energy becomes orgasmic. And your meeting is no longer with any individual person: your meeting is with the universe itself. You see a tree, you see a flower, you see a star, and there is something like orgasm happening.
The man who has become absolutely intelligent, alert, aware, lives in an orgasmic way. His every movement is full of orgasmic peaks, and peaks upon peaks. And when Tantra has happened, sex disappears. Sex is a seed, Tantra is the tree -- let the seed die and the tree will be born.
Each of your energies can have two forms: one is intelligent, one is foolish. Pythagoras is not against your passions -- no Wise man can ever be against your passions -- but every wise man is against foolishness, is against ignorance, is against darkness, is against stupidity, mechanicalness.
In sex you function like a robot. Something from the law of necessity, something from prakriti, something from lower nature, grips you, and you are no more yourself -- you are a slave. When you are a master of your own being, then you live in the same world but with totally different eyes -- the same world becomes divine.
-Osho, "Philosophia Perennis, Vol 1, #6"