Robots could demand legal rights

From a BBCNews article of the same title from a few weeks back:

Robots could one day demand the same citizen's rights as humans, according to a study by the British government. If granted, countries would be obliged to provide social benefits including housing and even "robo-healthcare", the report says.

The paper says a "monumental shift" could occur if robots develop to the point where they can reproduce, improve themselves or develop artificial intelligence. The research suggests that at some point in the next 20 to 50 years robots could be granted rights. If this happened, the report says, the robots would have certain responsibilities such as voting, the obligation to pay taxes, and perhaps serving compulsory military service. Conversely, society would also have a duty of care to their new digital citizens, the report says. It also warns that the rise of robots could put a strain on resources and the environment.

So, when the day comes that a robot is indistinguishable from human...will a distinction be made between human/human adultery/fornication and human/robot adultery/fornication? What would Asimov say?