12. Sin City: A Dame To Kill For
"Excessive nudity" was the reason for the ban hammer being dropped on this poster from the wayward Sin City sequel. Apparently, the MPAA rejected this Eva Green character poster because it was just too risquee.
Having too much of her breast so obviously on show, as well as the darker area of her nipple visible through her outfit was enough for the regulators to get a little too stimulated, despite the fact that other Sin City posters had been basically just as suggestive. It's also worth noting that the entire film franchise was fundamentally sold on the sexed-up image of femme fatales and guns - it's just that this one was a step too far.