Fair enough; if you're so hung up on this issue that Cortana won't let you treat her in some kind of perverse way, then you are under no obligation whatsoever to use her as a virtual assistant.
But don't then sit around wondering why people like me judge you as being of poor character. And before you reply, "I don't care what you think of my character," again, such is your prerogative. But then, you probably also have no idea if I'm your boss (or future potential boss), your loan officer, the person evaluating your college application, your potential friend, a possible future customer of your services, etc. If you're willing to live with the consequences of doing so, then by all means, please feel free to use as slutty a virtual assistant as your tastes desire.