We're kicking off the 25 sexiest movie scenes of all time with an absolute classic: "Titanic". You know exactly which scene we're talking about, but if you need a reminder, here are three words: "To the stars". The fumbling around in the back of an old car, the passionate kissing, the hand that slams against the window — we're trembling just thinking about it. This one is a little more suggestive, and a little less explicit, as far as sex scenes on the big screen go, but it's still guaranteed to get you going.