well when I was with my gf I would first start off just with kissing and then possibly caress her stomach with my lips and work my way up to her tits. also if you kiss down her back along the spine (it might be ticklish for her) but she will be turned on by it (also try along the shoulders and neck). all this doesnt have to be just kissing, you can use your hands but it seems she gets more out of it if you kiss there. basically tease her and she will be begging for it. just have to know where the most erogenous zones are for a woman.