First Kiss...Or Not

You know what I can't understand? How on earth it is that most movies in which characters supposedly haven't ever had any experience with kissing...At all...Ever...Supposedly know exactly what they're doing, and are completely at ease and lacking in any awkwardness the first time they kiss. Does anyone else see some kind of sad, sorry problem here? I do. For example, shown below are some examples of first kisses--most are obvious because of age...The other is clear from film context:

Those are first kisses...Most movies kisses are obviously not. Even at the point where you'd expect the individual to know how to kiss due to other relationships and marriage, there's still go to be some initial awkwardness there...At least I'd think so. It's kind of like in the trailer for the Chronicles of Narinia. Lucy stands in hesitation before opening the wardrobe, not because she's got any kind of reason to be hesitant, but becuase WE know what's on the other side, and WE need the hesitation to build. I guess they can't make the kisses terribly awkward, because they want the movie to properly flow...but couldn't there be some kind of middle ground?

Then again, maybe I'm crazy...That's always possible.