While kissing, keep your lips slightly parted when both your lips meet. It is importanat that you gently press them against your partner's. A slight angle at one side to your head will assist you for not getting your noses in the way.
What do you do next? It depends. If it's just a little kiss, a peck on the lips, you need to move away. However, (this is very important) don't move away all of a sudden, as if you were disgusted by his/her kiss! Just move away slowly, maybe while still holding hands, and looking in his/her eyes.
The Science of It All
Kissing is not limited to lips. Don't only kiss the lips. Kiss all parts of the face. Kiss his/her eyes, cheeks, forehead, neck, and hands. Remember 'he' must watch out that 'she' is comfortable. Then she will be more relaxed, and will appreciate your kiss if it's sincere. Beware! She'll definitely notice if it's fake. Finally, let your imagination run wild.
If you don't want to ruin a perfect kiss, then make sure you don't have a bad breath. Before going out on your date, make sure you brush your teeth; have a mint on you at all times. If you are going to eat before the actual kiss, make sure you take a mint or two right after you finish eating. You don't want to her to feel disgusted.
When she isn't looking, run your tongue over your lips once before you kiss. Slightly moist lips make it easier to move your lips over your partner's, and gives you both a more pleasant experience. Open your mouth slightly and place your lips over your partner's. Do not hold your breath! Breathe through your nose. As your lips meet, press them gently over your partner's. You may wish to move your lips in a slow, circular motion or just leave them still over your partners.
Stand close to your partner. As the two of you move closer together, tilt your head slightly. If you can see which way your partner's head is tilting, tilt your head slightly in the opposite direction.
Keep your eyes closed once you are into the kiss. You might want to keep them open until you have actual lip contact, so you don't miss and end up with a mouthful of ear. But when the kiss has started, eyes closed is the way to go. It can really help you shut out the world and focus only on the kiss. Also, kissing with your eyes open can creek anyone out.
Hands also play an important role in a great kiss. There are many ways you can use your hands during a kiss. The most popular way is to put one hand on your partner's waist and the other one against the middle of their back. One of very romantic ways is to use your hands to cup your partner's face in your hands. You can put them around your partner's neck or put them around their waist. You can also hold your partner's upper or lower arms gently, run your finger's through their hair, or just hold their hands in yours.
Resist the urge, for now, at least. Take my word! It can ruin a perfectly good moment.
Keep your lips soft and gentle. Also you can think of kissing something very tender while kissing. Practice is very important. Now where to practice? You can practice on the back of your hand! There are long kisses, and there are kisses made up of a whole bunch of short, gentle little kisses. Let your partner take the lead if you are not sure which way the kiss is going. When you are in the middle of the kiss, concentrate on feeling the friction between your lips and his/her, the electricity when the surface of your lips and his/her match up, and how each of you are moving your lips in rhythm with each other. Getting out of your head and focusing totally on the physical sensation of the kiss can add some real power and sensuality to your kissing.