How the X Rating Came to Mean Porn (and Nearly Ruin Movies for Grown-Ups)

“Duel in the Sun is unarguably lurid, but it was produced by David O. Selznick, a follow-up to his triumph Gone With the Wind … If David O. Selznick produced Duel in the Sun as an adults-only film, why does the idea of James Cameron producing an ‘adult film’ seem preposterous? How did we get to the point where ‘adult film’ became code for prurient, puerile depictions of sex?”