I don't think caring comes into it one way or the other. They get paid to do a job of some sort, even though I don't think they do much or that it is especially difficult. I think of it more like renting space than selling sex. If one of them (or anyone else who thinks of themselves in caring professions - I don't really think nurses or mds care either - but if they do - then fine) manages to care - it is not really the point of the endeavor from what I experience.