Allegedly his girlfriend's email got hacked after he sent them to her. A lot of people think she leaked them on purpose as a publicity stunt. I know his handlers went ballistic when they were leaked, threatening to sue every site that had them up if they weren't taken down.
Just goes to show, if you don't want those kind of pictures out everywhere, don't take them and send them to your girlfriend.
Although, from what I hear, this type of thing, especially players sending cock pix to groupies is quite common. Rather risky, 'cause if you piss off the wrong girl, she's going to leak them.