There have been plenty of phoney dick pix on the web, bothcut and uncut. But theauthentic word I have is that it is uncut...but didn't get size detail.
He had a litrtle puppy-face in Titanic, but since then must have been working out. He's filled out well and become much more the adult male. In Blood Diamond I can say with authority that he (or perhaps his voice coach) achieved remarkable results with his South African accent. Even I was convinced...and it's one of the most difficult accents to copy. VERY few actors do it successfully - most go semi-Australian