The Princess Bride has a couple good kissing scenes in it. :) In the Fire Swamp and then again in the royal suites where Wesley is lying on the bed and keeps saying "Gently" and yet again at the end when they're on the horses. :)
I can honestly say I have never practiced kissing. It has never occurred to me to do so. That said... I've never had a boyfriend, really. I mean, yeah, I've gone on a few dates, but that's all it ever was. The guy always decided that he'd rather be friends. I guess because I dated guys who were friends first? I dunno. One gross guy in high school did try to kiss me. I slapped him. lol.
Angela Bassett and Ralph Fiennes toward the end of Strange Days. That was one of the hottest kisses ever.
I don't watch much movies at all, so I know i'm not going to be good at this!! The last movie I watched was about a year ago! It was a historical one based on Penelope Williamson's book, The Outsider. I remember some kissing scenes in that one with Naomi Watts and Tim Daly. Here's a link for the info on the movie. I don't know if you'd consider it a great kissing scenes, but it was a wonderful romance story:
There's a dramatic kissing scene in "The Quiet Man", which was memorable even to Steven Spielberg since he used it in E.T.
I can't say I've ever practiced kissing.