I've been told by GF's that they don't exactly look forward to cum in their mouth with their man, but they do it because they know men like it and enjoy pleasing. I've heard it tastes like snot, or a combo of egg whites and sea water, and even tin-foil.
I would certainly abstain from some foods and have more fruit. A buddy once told me his GF refused to blow him at all if he drank coffee. And liked him to eat lots of celery and melons.
