Ninja Assassin
If Ninja Assassin boasted sexual content equivalent to its level of violence, it would be rated NC-17 and repulse even the most dedicated perverts. However, the MPAA is much more accommodating when it comes to wall-to-wall bloodshed than consensual relations between loving adults. So while the ratings board might go into conniptions over an art film in which a woman receives oral sex, it has no problem with a protagonist who spends most of his time vivisecting enemies with a sharp chain that tears through flesh like a knife through butter. Ninja Assassin is ostensibly a vehicle for Korean pop star Rain, but the real star is the blood that gushes and spurts from the wounds of an army of interchangeable bad guys.