I remember that a TV show (can't remember which one now) years ago put a camera in the cleavage of a very well endowed page three type girl. It was hidden in a brooch or a necklace or something. They then took her round public events, and got her to speak to very well known people and politicians, to see if they snuck a look.
From memory, the only person that managed to not get caught out was Tony Blair, but it was clear from his zombie like fixed, unblinking stare at her face that it was taking considerable concentration on his part!