In discussing movies with R this morning, I said the first scene in "Milk", wherein Sean Penn picks up James Franco in a subway station, proves the cliché about the sexiest movie scenes being ones in which both parties remain fully clothed. Two more examples: the trunk scene in "Out of Sight" and the phone scene in "It's a Wonderful Life". R thought lots of people would nominate the eating scene in "Tom Jones" (although he thinks it's highly overrated).
In any case, the category is "Sexiest Scene in Which Both Parties Keep Their Clothes On". Put your picks in comments.