I'm sorry, but I just must say... KISSING IS SUPPOSED TO BE AN
INSTINCT! I made out with this one guy once who's old
girlfriend (he was straight at that time) told him that he was a bad
kisser, so he looked at one of these advice things...
Kissing isn't something that you should read about, or think about. You shouldn't have a checklist where you say, "Have I looked into his eyes? Check. Am I breathing regularly? Check." Let the kiss speak for itself. Don't think. It should be purely an emotional experience.
And, as a guy, I just want to say that a close-mouthed kiss to me seems like a girl or guy isn't interested in me. Personally, I feel that close-mouthed kisses should be saved for someone like... I dunno... A family member or a friend. If you're dating someone, you should have an open-mouthed kiss. It doesn't mean a commitment or anything. Girls just have a habit of making some kind of big deal out of something that really isn't.