No, this is not a suggestion to participate in any form of prostitution. Actually, it is quite common for people, especially college students, to sell blood plasma, hair and breast milk for a certain fee. While a kidney would go for a premium, there are federal laws that inhibit the selling of human organs, even by the person who the organ belongs to; however, there are certain parts of the body that can be sold, including hair, blood plasma, and in some states, breast milk. While the prices for these biological commodities vary from state to state, it is not something that will make you rich, but it can help meet an immediate need for money.