I had a gf like that. We tried a sweet/tart flavored lube, and that seemed to help. She can also have a mint in her mouth during the activity. That might also help. Also, if you eat pasta a few hours before, several women have told me it makes the man taste good. I thought they were pulling my leg, but they were serious, and my gf agreed.
I have a long time interest in psychology, specializing in relationship dynamics for 30 years.
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