"He learns that the capacity of sex is physical, a mechanism for the use and expression of his spirit, the means of expressing in physical form one's greatest celebration of life, of joy, of one's highest self-exaltation and one's highest moral values in regard to man—that is, in regard to himself and the woman of his choice. He learns that sex is the means and form of translating spiritual admiration for a human being into physical action—just as productive activity is the translation of spiritual values into physical form, just as all life is a process of conceiving a spiritual purpose, based on one's spiritual code of values, then giving it a material form—which is the proper, moral, and complete cycle for man's existence, for the relation of man's spirit to physical matter. The spirit sets the purpose and uses matter as its tool, as material; the spirit gives form to matter. Just as pure "spirituality," divorced from physical action, is evil hypocrisy—so is the materialism which attempts to have matter give man purpose, value, and satisfaction. Just as "Platonic love" is evil hypocrisy—so is purely physical sex, which is an evil destruction of one's values."
Ayn Rand, The Journals of Ayn Rand, p. 606 - 607