Well. I believe it is as osho quotes it :

When love expresses through you it first expresses as the body. It becomes sex. If it expresses through the mind, which is higher, deeper, subtler, then it is called love. If it expresses through the spirit, it becomes prayer.
You see a flower in bloom have you ever considered that the blossoming of a flower is an act of passion, a sexual act? What is happening as the flower blossoms? The butterflies will sit on it and carry its pollen, its sperm, to another flower. A peacock dances in full glory a poet will sing songs to it, your saints will also be filled with joy at the sight of it. But aren��t they aware that the dance is an overt expression of passion, that it is primarily a sexual act? The peacock is dancing to seduce its beloved. The peacock is beckoning to his beloved, his spouse. The bird is singing, the peacock is dancing, the boy has become an adolescent, the girl has grown into a beautiful woman�� these are all expressions of sexual energy. These are all different manifestations of sexual energy. All life, all expression, all flowering is basically sex energy. And it is against this sex energy that religions and cultures are pouring poison into the minds of human beings. They are trying to engage human beings in a fight against it. They have entangled people in this battle against their own basic energy, so they have become wretched, pathetic, devoid of love, false, nobodies.
One has not to fight with sex, but to create a friendship with it, and elevate the stream of life to the heights.