Sexiest scene in a movie?!

Sexiest scene in a movie?

I've always been captivated by films where the attraction is underplayed and clothes (usually, or for the most part) kept on. Not that I have any objection to nudity, which can also work (think of Donald Sutherland & Julie Christie's famous lovemaking in 'Don't Look Now'). However, if I had to go for one it would be Maggie Gyllenhal and James Spader in 'Secretary', especially the climactic scene where she tells him she loves him.

Incidentally, to those respondents who find themselves 'grossed out' by the mere posing of this question - maybe you should ask yourself why the simple mention of sex creates such a reaction.