Never burp when kissing.
Whiskers are a definite faux pas.
Don't try to stick your tongue down the young lady's throat.
Sensual, but not sloppy is the key.
To learn the proper technique or to perfect your technique a lady suggests the following exercise. Go to your nearest grocery store, purchase a few overripe peaches; very, very soft. Then, carefully, try to eat the peach without using your teeth!