One thing I learned about myself (and I'm strictly talking about myself) is that I don't care what people do as long as they are not harming others. If an adult wants to exploit her body in a quest for money, then she should have the right to. It's none of my business....just like gay marriage is none of my business. Does prostitution make me feel uncomfortable? Yes. I wouldn't like knowing that there is a brothel a few miles away from my house. But my perception of ethics shouldn't be a standard to which other people live by.
The Fine Art of Regulated Tolerance: Prostitution in Amsterdam by Chrisje Brants. Her article was published in the Journal of Law and Society.
Markets in Women's Sexual Labor by Debra Satz. Her article was published in the "Ethics" journal.
You can also read more about legalizing prostitution here: http://www.fff.org/freedom/ 1293e.asp