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Why, when we try to think of a sexy movie, does it have to have sex in it? Rhetorical by the way. I agree that sex does make a movie sexy (or trashy depending on the film), but can't a movie be sexy without ony sex in it.
To me, I think lighting and cinematography can alone make the movie sexy. For example, Van Helsing. Debate its merits as a film all you want, but it was a sexy movie...and not just because Hugh Jackman is so dern hot.
More recently, while not your standard film, the new AFI music video, Love Like Winter. There is no sex or romance (really) in it. Heck I don't even know what the song is about. But the video is gorgeously sexy, all due to the lighting, camera angles, music, and set. In case you might be thinking this, I do not actually find the AFI band members to be particularily attractive, so that is not an influence. Watch it, see for yourself.