I think we all are looking for others to notice much more then others actually do, people are far to busy to take the time to look. With that said though, woman are far more observant then men and in an office setting with time on one's hands that more "detailed" observation is possible.
I also believe that in the deep recesses of our minds we want to be seen as our true identity, so enjoy the game of being caught and providing an answer that best suits your situation.