How Can I Make MY Girlfriend Orgasm From Oral Sex?

For the the past few months I have been trying to make my girlfriend have a orgasm from me giving her a oral sex but had no success. When use my finger she always have an orgasm, but when I use just tongue she it doesn't work. In my past relationships I was always able to make them orgasm from my mouth only,... show more For the the past few months I have been trying to make my girlfriend have a orgasm from me giving her a oral sex but had no success. When use my finger she always have an orgasm, but when I use just tongue she it doesn't work. In my past relationships I was always able to make them orgasm from my mouth only, but now it doesn't work. I'm using every technique in the book on her with no success. I need help??? Any advice??
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