A poster for the Sin City sequel A Dame To Kill For has been banned by the Motion Picture Association of America (MPAA) for showing one of its stars Eva Green holding a gun and looking sultry in a revealing thin gown. Of particular concern to the conservative watchdog was the "curve of under breast and dark nipple/areola circle visible through sheer gown." Note – the weapon used to kill people is allowed, but the boob isn't. Strange?

Considering that the first Sin City film was a glorious comic-book influenced hurricane of sex and violence, the poster doesn't seem particularly off point and probably doesn't contradict any trading standards. Green is no stranger to going topless on screen either, having spent a large percentage of 300: Rise of an Empire scantily clad.

The film is again being co-directed by Frank Miller and Robert Rodriguez. Miller is the genius graphic novelist whose work has spawned iconic Batman movie The Dark Knight, which proved to be Heath Ledger's lasting legacy in cinema shortly before his tragic death.

The new film is based on the second book in Miller's Sin City series and also stars Jessica Alba, Rosario Dawson and Ray Liotta, alongside a hotly anticipated cameo from Lady Gaga. We can't wait for its release; we just hope that the MPAA will allow Ray Liotta's "curve of under breast and dark nipples" on screen.