Not to purposely touch a sore subject, but they also work in a condom only environment.

I've known several dancers who have worked for escort services. Each one of them has admitted to going bareback if either: 1) the price was right or 2) It was a regular customer with whom they felt comfortable. Not to mention that many "condom-only" agencies promote GFE, which leaves the escort succeptible to gonnorhea, herpes, and even aids should she choose to swallow.
Why do porn stars escort? For the money.