Market mechanisms are inappropriate for the exchange of some goods, such as children, medically needed bodily substances or organs, and sex. These are precious goods, and we should not allow citizens to alienate these goods for payment. Instead, the terms of alienation should protect the critical interests of all involved.  While sexual relationships serve legitimate needs, it does not follow that we should be able to purchase them. Having children serves legitimate needs, but we do not think that people should be able to buy children. Buying sex robs the provider of dignity and the right to sexual autonomy. Moreover, people are not entitled to some goods simply because they have money. If we allow money to determine who can have children, donated organs, or sexual intimacy, then this will lead to unfair distributions. Market mechanisms may eclipse other forms of exchange, and deprive those without significant wealth of the means to happiness.