??The point I try to make?, [Laura Mar?a Agust?n] says, ?is that whether you are a transsexual, male or female, you may be able to be a sex worker for a while and not feel it is so horrible. I don't try to argue that becoming a sex worker is always about making a free choice, but I don't believe that most people who work in offices or service jobs, for example, always necessarily felt they had unlimited options or a vast number of possibilities available to them, either. So among all the messy situations people can find themselves in, some prefer to sell sex.?? Nathalie Rothschild reviews Agust?n's provocative new book, Sex at the Margins: Migration, Labour Markets and the Rescue Industry.