The men who think that wealth comes from material resources and has no intellectual root or meaning, are the men who think—for the same reason—that sex is a physical capacity which functions independently of one’s mind, choice or code of values. They think that your body creates a desire and makes a choice for you just about in some such way as if iron ore transformed itself into railroad rails of its own volition. Love is blind, they say; sex is impervious to reason and mocks the power of all philosophers. But, in fact, a man’s sexual choice is the result and the sum of his fundamental convictions. Tell me what a man finds sexually attractive and I will tell you his entire philosophy of life. Show me the woman he sleeps with and I will tell you his valuation of himself.
While this doctrine may appear absurd in light of common experience, it is entirely consistent with Rand's general views of human psychology. If, like Rand, you believe that an individual's psychology is the product of his "choice or code of values," then of course his sex psychology must be a product of his "choice or code of values" as well. What is particularly interesting about this passage is the suggestion that desires are a product of choice. Rand had speculated that desires are a product of one's thinking (or choice) in her journal, but she generally kept a distance from that view in her public writings, opting instead to merely insist that emotions, rather than desires, are the product of value-premises. However, as Rand left no detailed account of her view of human nature, it's difficult to determine exactly what she thought, or how far she wished to extend her belief that value-premises and choice determined psychology. As usual for Rand, she opts for grand, sweeping rhetoric, mixed with scolding against unspecified dissenters.