On the Kartographers threads a guy named Selco lived in a Bosnian city under siege, there were women turning tricks for a canned good.
I learned at my church Sunday from a speaker that girls working as prostitutes for mere sustenance is fairly common. In India one of their most successful projects is to teach these girls to be seamstress and then provided them with a sewing machine and help them start their own business. Cost a mere $150.00