If the disabled person is not right in mind to make that decision, than they should be allowed to do prostitution, for their own protection. They may get into trouble from being neive and such. This is somthing like decisions don't come adequately in a bad mood. They need to be explained all the risks, and made sure they know exactly what they are getting into. Sometimes people think they do, and they get more than they bargined for. There is a scientific law of some sorts, anything that can go wrong, will go wrong.