expat...many of these girls have chosen this life - and in many cases know exactly what they are getting in to?
Your reasoning is based on "new morals," (man-created) ie...."choice, consent, moral autonomy (in place of unchanging transcendant absolutes), and privacy. All of these "new morals" are founded on the notion of "self ownership" and man as the highest authority.
Now, if it's morally ok (per the preceding 'new morality") to "rent" one's body (engage in prostitution), then it follows logically that one can "choose" to become a slave to another person.
Hence, slavery is ok whenever it can be 'claimed' that all parties are in agreement. Likewise, one can 'choose' to become the 'dinner' of a cannibal in the 'privacy' of one's home (remember the fairly recent German cannibal case?). But yet all of the proponents of "new morality" find themselves feeling somewhat squeamish about their 'new morality' in affairs of this nature. They suddenly 'discover' the usefulness of 'old' moral absolutes.
A worldview is only as good as the 'walls' it keeps you from running into. The Libertarian 'worldview' is flawed, as it causes one to run into very discomitting walls at every turn.
What I failed to convey is that in many cases the girls willingly enter into a partnership with their agents. They are advanced money and then pay the money back with interest.
Why does the girls choose to do this? Why would a girl choose to become a topless dancer in the United States, or why would a person choose to deal in drugs? Why the focus on Europe or SE Asia when this happens everywhere.
I believe that it is wrong, I just believe that the girls in many cases are not completely innocent of blame.