[MrDK]

You are right in saying that the girls have a choice, if the meaning is - as opposed being forced to do what they do. Of the girls "we" encounter none are forced to do what they do (IMO).

On the other hand I believe that there are a number of girls who get into this line of work as a last resort and believing that they have no other choice. Often this is because of a costly event of a family crisis. Many of these girls with try to resume normal life when matters are sorted out.