Sex in cinema has changed so much in the last ten to twenty years.  I don't think it's so much that peoples ideas of what is or isn't sexy has changed, but may have more to due with porn being so much more mainstream / available to the masses via the internet.

What movie(s) did you find sexy or titilating in the past and what have you found sexy recently?  And are they the same?

For me, then:

Body Heat
Bound
Eyes Wide Shut
Lair of the White Worm (amazingly not a porno, but equally amazing that the title hasn't been re-used for one!)
Tie Me Up Tie Me Down
Risky Business
Henry & June
Lifeforce
Mullholland Drive

Now:

Secret Things
Exterminating Angels (crap tital, but steamy film)
Black Swan
Secretary
Malena
The Dreamers
Chloe