Rape and Molestation

I'm not talking about having them simulate their preferred variety of victim or the scenarios they desire, just that they might be a therapeutic tool more patient, willing to face risks, and put up with such a person as they gradually bend them back to acceptable behavior.

Although you might be right. I've heard that pedophiles in particular have a dismal recovery record. On that, there's promise of early identification and correction with brain scanning. CBC Quirks and Quarks had a really good podcast on Neuroscience and the Law. For example, there is some evidence that brain damage in a certain region of the brain is what drives pedophilia.

As for prostitution, I think that the human variety will be driven out of business (and subsequent human trafficking) by lower cost droids, especially since they theoretically shouldn't pass on a disease to you. Additionally, if programmed correctly, it would end the urge for this type of behavior and this type of furtive behavior would be obviated. On the other hand, I guess some people get into the sneaking around aspect of it, but at least the human victims will be removed.

Here's another important implication of realistic, responsive droids: humans driven out of the customer service industry altogether. You already see "self-checkout" aisles at the grocery store and automated messages with your credit card company. I predict that advances in chatterbot technology will continue to gradually push people out of the lower tiers of the service industry.