Hm... stick of cinnamon gum is an interesting idea. I'll ask the next provider I see to do that before seeing me. Do you do it yourself too?  

I think it's the websites like this that might have facilitated popularizing of kissing. Providers very quickly figured out that hobbyists would avoid those that don't kiss in such numbers that they almost had no choice but to put it back on their menu. Probably the same as with BBBJ but even more so.  
In fact I'm pretty sure that it played a big part in it because in the countries where internet is not as prevalent as it is here and many hobbyists still don't use it as much, they still complain that their providers largely don't kiss while here from what I understand, even on the street girls almost never tell you anymore that they are "saving kissing for the right guy"

As for what constitutes good kissing is... in my experience it's so individual.  

I love kissing. In fact if I see a provider whose review is marked "No" or "I don't know" for kissing, the rest is really doesn't matter. She could be my erotic dream come true for all I care in other ways, I've already moved on to the next profile.  
I used to date a bad bad kisser. I'll skip the details and if you really want to know you could PM me but no matter how hard I tried to lead her in the direction I wanted us to go in that department all was to no avail. She was quite adventurous in other ways but several times when I said: "Let's try it this way" in regards to kissing it just would go neither right nor left, in fact she'd go "Oh... you don't like the way I kiss but I thought I was so good".

I think there is a time and place and the mood for everything. I like deep hard kissing with your tongue hard and your lips wide open (notice I didn't say your mouth), and a lot of body pressure involved. That what would make blood rush to your face and maybe even your head spin. Light erotic kissing when done well, in my experience, may have tingles going down your body but it hardly arouses much fire. I usually prefer it as a pull back, a break of sorts, when you start hard and then pull back and giving her a break with some technique that involves very light touch of tongue and lip action.  

I already had a PM exchange in regards to this with one of the providers here and I'll just cut and paste some of what I wrote to her:
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As for the so called "art of kissing", I think in general it still is very personal and just like with dating largely depends on people clicking in that particular department and maybe just a little bit more.

My personal beef with most of the people in that regard however is that there seemed to be an opinion that kissing mostly involves some inventive tongue action while I believe that it still primarily is a "lip service". Sure, tongue work is important and varied people do it with various degrees of inventiveness but the lips, and not moving them up and down, left and right somebody's face or body, but manipulating their shape and pressure, and trying to maximize suction area, while basically keeping kiss stationary is largely being ignored, as well as the light usage of teeth.

But strip it all down and it still boils down to people clicking. I'm yet to meet a provider that thought of herself as NOT an amazing kisser (unless of course she just plainly didn't like kissing period). However I only ever met one that I thought was truly a great kisser (unfortunately soon after seeing me she moved to Vegas). Surprise surprise she seemed to think that I was ok in that department as well (and I'm sure that not all of them do too). The way it went between us with kissing and the way she later mentioned it without being prompted, kind of thoughtfully, as though to herself, while washing her hands and face right before I was about to leave, made me think that that part of her "providing" might've not been an act. But you know what? When I mentioned that I thought that she was a great kisser on USG nobody seem to back me up in that opinion :