The phrase “passionate kissing” in For the Strength of Youth (, 36) has to do with the kind of kissing that goes well beyond a peck on the cheek or briefly touching lips. It’s more intense and lasts longer than a brief kiss, and it’s often a step along the path to more serious kinds of physical intimacy, which is why you are warned against it before you’re married. For the kind of dating and relationships you should be experiencing before marriage, it’s wise to hold back with your kisses, especially kisses on the lips.
As President Spencer W. Kimball (1895–1985) once said, “Kissing has … degenerated to develop and express lust instead of affection, honor, and admiration. To kiss in casual dating is asking for trouble. What do kisses mean when given out like pretzels and robbed of sacredness?” (The Teachings of Spencer W. Kimball, ed. Edward L. Kimball , 281).