What rating ( PG , PG-13, or R) Do You think WATCHMEN is?

Its an R, the footage shown a few days ago was introduced by Zack Snyder who confirmed this and mentioned that there was an "explicit" scene, not to mention strong violence. Plus I've read the graphic novel and can confirm some of the themes and issues covered will definitely not be suitable for a PG-13. I wont say more for fear of spoiling it, but I hope this helps :)