Now every lady is different and likes different things but when it comes to oral sex, lapping away like theres no tomorrow is not often the best way to achieve thought and technique go a long way.
Me own preferences for this as follows, take your time, don't necessarily dive straight down between her thighs but Trace your lips and tongue over the stomach or from the back of her calf muscles teasing as you go, when you get near then lightly brush your lips over hers and trace your tongue around the edges, teasing is as much fun as the actual doing, once you start to give oral then pay attention to the area around the lips as well as her clit, use tongue and lips together but lightly at first then gradually applying more pressure till your lady tells you (one way or another) that your hitting the sweet spot.
And for you ladies, talk to your men folk (or women folk) about how you like things done before hand, it can be part of foreplay if you make it sexy and inviting and im sure the results will pay off.