Yeah, I definitely think Shamy's kissing is something that will keep progressing. These kissing were extremely passionate (look at HOW CLOSE THEY ARE TO EACH OTHER IT'S LIKE THEY'RE TRYING TO OCCUPY THE SAME SPACE) but real open mouth/french kissing will probably be saved for later. The writers have been so good at making their kissing believable by having each one just a step up in passion from the last (although I would argue these kissing are about 5 steps from the anniversary kiss - you can feel how much they missed and love each other). I think having them jump to shoving their tongues down each others throats would have been OOC and would have tainted the sweetness and love between them for this scene. You have to remember they are still so inexperienced and their sexuality is just beginning to awaken. Their first time was above everything else an act of love, but I wouldn't be surprised now if the heat gets turned up a couple notches. They don't have to make a whole story out of it, but something like jlove suggested. It would be funny in the next couple months if we had an episode where Shamy are sexually frustrated and want each other but the schedule or something stops them. I would love to see Sheldon say "to hell with the schedule" and grabs her and kisses in a way that has everyone fanning their faces.
But for this scene, I thought these kisses were perfect. Just the absolute perfect mixture of passion, desire, sweetness, innocence, and Shamy quirkiness,