I don't know if this has been brought up and I thought it might be a good feature. A few sex games I've played had a "Boss Key" that would quickly close the game or put a fake "work" page up with pause. If you live with someone that you don't want to know what kind of games you play it would come in handy. I doubt anyone would play it at work but a dorm or roommate situation might make it handy also.

Using F9 you can instantly exit. So best to use that if you have surprise guests.