The first X-Men movie opened on July 14, 2000. A child born early that year would have just turned 17 by the time the tenth entry in the X-Men series, Logan, hits theaters next month. That is fortunate – viewers are going to need a driver’s license to get into this movie, which possesses the hardest R rating of any American superhero movie in history. In the past, Hugh Jackman’s Wolverine would swing his razor-sharp adamantium claws and bad guys would simply fall to the ground. There was never any visible evidence of his brutality. There’s more graphic violence in Logan’s first scene – severed limbs, gruesome disembowlings – than in all of the other of the Wolverine and X-Men movies combined.