When fingering a woman you need to remember several things.
Most are common sense, but are easy to forget and others are not so simple.
Firstly, and most importantly, you should be focussing on her. Forget this and you might as well not even bother. If you don't think you can focus on her, then don't bother. Better to do nothing this time than do a really crappy job and screw up your chances for the future.
Secondly, vaginas are fairly sensetive areas, so keep that in mind. They are made out of flesh, not steel, so don't be too rough. Also very importantly, if your nails are jagged, it will feel like you're sliding spikes in and out of her, certainly not the most sexy feeling one can experience.
Thirdly, and very importantly if you want to REALLY wow her. Once you're done, you're still not done. What I mean is, women can have multiple orgasms. Once you've given her one, the second one will follow much easier than the first.
Also, make an effort to pleasure her, don't do it just for the sake of doing it, otherwise it's just pointless and it will certainly show. Also, she probably wont try very hard to please you.
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That's all for this lesson.
Stephen Warren, creator of the Ultimate-Fingering-Techniques.com" fingering guide.
If you want to learn how-to-finger-a-girl then go to http://www.ultimate-fingering-techniques.com and sign-up to my newsletter for a free chapter of my new book and a FREE 3 day fingering guide