I swallow. If it's worth doing, it's worth doing completely. However, if he cums a lot, I'll let it overflow from my mouth rather than swallowing and (perhaps) biting his dick.

If he'd rather pull out and cum on part of my body instead, that's ok too. Or, if he'd rather not cum while I'm eating him, and cum in my pussy instead, that's *fine* with me.

If he cums in my mouth, it definitely requires a chaser. Coke (TM) is the best thing I've found to date for the chaser! It really gets rid of the unpleasant taste.

And, yes, I've noticed a big difference based on diet. Men who live on "meat and potatoes" taste pretty bad, generally. Vegetarians, vegans particularly, taste good. I had one guy who ate A LOT of garlic. His cum tasted like garlic too. (I didn't mind, because I ate about as much garlic as he did).