She may be so self-conscious that no amount of effort on Step 1 Removing the Brakes to her Sex Drive will allow her to fully enjoy it.
You can now start to use your tongue in light motions across her sensitive parts.
No woman has ever had an orgasm whilst doing algebra.
For this reason, you should avoid putting cream, chocolate sauce or any other food on or near her vagina.
My advice is to talk to her and experiment.
But the appetizer to our Saturday morning is me down on her till she gets hers once.