Human pheromones can be used for intimacy. Next time you are intimate with a girl, subtly notice what she's doing to you. If she likes kissing you it means she likes being kissed. If she kisses your neck/bites. She likes being kissed there/bitten. If she sucks your tongue when kissing, you don't need me to tell you what that means :-P
What I am saying is, what she does to you is a strong indicator of something she likes receiving. Pay attention to a woman's cues. The advice of paying attention to a girl's cues will probably help you enjoy better love with a woman than what most fellas do.