Hm, I don't know if it's just me, but a lot of the time I don't really mind that most romantic scenes I've seen so far are very "chaste"... Sometimes, though, I also wish for something different, so I understand you! ;) Of the titles mentioned, I have only seen two (Last Cinderella and Kimi wa petto, both are very good imo, and not just because of the few good kiss scenes!) but I've added a few of the suggestions to my PTW list. Thanks! :)
I have only seen one drama with not just a few hot kisses but actual sex scenes: the k-drama Temptation of Eve. I was very surprised by it because I did not know something like that was possible for an asian drama. ;) However, I dropped this drama because: a) the plot in the first episode was ridicilously predictable, b) the plot in the second episode made little to no sense, c) the first 20 or so minutes of episode 3 were very boring. So... I wouldn't recommend it if you want a good story along with the steamy scenes, but it's only four episodes, and I did sit through more than half of the drama...
Edit: I recommend taking a look on that thread linked by axndrama! They're not just talking good kissing in that thread.... I just started watching The Green Chair on YouTube. There's steam!!