It is bizarre to me that a woman can legally carry a child to term for money but cannot engage in "normal" sex (that is, without a test tube or artificial insemination being involved) to produce that child.

I agree that prostitution should be legalized but I do not for a moment believe that legal prostitution will end illegal prostitution. For one thing, pimps will still prey on homeless girls, getting them addicted to drugs and forcing them into selling their bodies.