Ecstasy (1933): Two decades before Ingmar Bergman helped popularize European film nudity with Monika, this landmark Czech import featured soon-to-be-star Hedy Lamar not only streaking but engaging in cinema's first sex scene. Yes, it's just a shot of her face, but when was the last time a Hollywood film depicted the female orgasm? Coming Home?
North by Northwest (1959): The king of subliminal sex, Alfred Hitchcock planned Cary Grant and Ingrid Bergman's epic kiss in Notorious; and in To Catch a Thief he cut from Grant and Grace Kelly making out to a shot of fireworks. Wink! But he topped both in North by Northwest, first with a slow bump 'n' grind session between Grant and Eva Marie Saint, and later with a shot of the two leaping into bed that cuts to a train going through a tunnel. Gee, wonder what that means.
The Thomas Crown Affair (1968): Pierce Brosnan and Rene Russo may have doffed their clothes in the remake, but even the latter's apparently God-approved nudity can't top the close-up-heavy chess scene with Steve McQueen and Faye Dunaway, which climaxes in an uninterrupted 70-second smooch.
Out of Sight (1998): Steven Soderbergh tipped his hat to Don't Look Now's beloved rogering sequence with the hook-up scene between George Clooney and Jennifer Lopez, which alternates between foreplay and coitus. Only difference? Sight stops at the undergarments. And yet both are equally scorching hot.
Brokeback Mountain (2005): Some complained--notably Jonah Hill in a Knocked Up deleted scene--about the lack of graphicness in what was touted as a major step for mainstream acceptance of homosexuality. But c'mon: Heath Ledger spits in his hand before sticking it in Jake Gyllenhaal. Actual man-on-man butt sex isn't everyday for Hollywood product, much less one that minds being, y'know, accurate.
Atonement (2007): All tight shots and loud huffing and puffing--it's almost a relief the big scene between Keira Knightley and James McAvoy doesn't get past second base.