On a female, her clitoris lips will be the center spot of her sensitivity. You cannot take the advice I'm about to give lightly, it is very easy to abuse her lips. Doing it wrong will bring her tremendous amounts of pain. There is a very thin line between just right and too hard, it only takes a second to make too much. This is especially true if the female you're treating hasn't had much experience with receiving oral sex. You NEVER EVER want to start out with her by attacking her lips, this must be worked up to, or you'll ruin the whole mood. NO ABUSE! To put this in perspective for the fellahs, would you want a female to jump into bed with you and smash your cock with a hammer? This is a wack analogy, but you get the idea I think. You can be rough to a point, when the time is right but you gotta know when to ease up. It's about the motion and rhythm you use, not how massively you go at it. A Start, stop, start, stop pattern isn't ideal. It's better if you give attention to all of it, but don't waste too much time in-between The clit lips are very sensitive to touching and licking, so show it some respect, as fast as you turn her on you can turn her off. Licking from bottom to top is wack, it's not about how much area you can cover but how you cover the area. It could take you many, MANY tries to learn your womans clit, and what she likes, but stick with it. In recap, REMEMBER the clit is somewhere you ease up to, don't ever start there!