From Sex to Super-consciousness by Osho [rare books]

The book is not for sex, it is the only book in the whole existence against sex, but strange....

from Sex to Superconsciousness

The book says that there is a way to go beyond sex, you can transcend sex that's the meaning of "from sex to superconsciousness." You are at the stage of sex while you should be at the stage of superconsciousness. And the route is simple: sex just has to be part of your religious life, it has to be something sacred. Sex has to be something not obscene, not pornographic, not condemned, not repressed but immensely respected, because we are born out of it. It is our very life source.

I request you to approach sex only when you are feeling bliss, feeling love, when you are cheerful, when you are prayerful; only when you feel that your heart is full of joy, peace and gratitude. Only a person who approaches sex like this can experience superconsciousness, samadhi.