Leaked celebrity photos

You can't go a week these days without hearing about some celebrity getting their phone hacked into and private photographs leaked on to the web. There's also a tonne of fake imagery that is churned out containing celebrities heads terribly Photoshopped onto stock imagery of naked bodies. I find this the most bizarre but curious thing about the celebrity in the world of the media.
Most of the time, these photographs contain nudity. What I want to know is;
-Why, if you're famous, would you take naked photographs of yourself on a mobile phone if you knew that people would be able to sell these images for profit?
-Why is society so wrapped up in knowing the celebrity is just a 'normal person'; that a photograph proving the fact they're human turns everyone on so much?

There are lists and lists of google search finds of websites dedicated to leaked celebrity photographs. Is this a new way of self promotion? Creating a drama around a certain celebrity when coincidentally, the said celebrity has a new book or film or album out to sell?