Build sexual tension between you and the girl. This is where you step things up from being friendly socializing to palpable desire. In learning how to kiss a girl, this step is just as important as knowing if she’s interested in you. Make sure you flirt – a lot. Move in close to her body. Touch her elbow, her shoulder, her hair, and then her face. Try whispering in her ear, then gently kissing it after the whisper. These techniques of flirting will push her sexual arousal right up the scale.