I don't think there is a conclusive answer for this at all.
It depends on the woman.
It depends on what the woman has been doing all day prior to muff-diving.
It depends on the time of month to a degree (and no, not just her bleeding - her monthly cycle will change the consistency and taste of her juices).
Some women I've been with had a definite "taste" while others were like... licking your arm when it's wet (no taste).
If you are afraid of going down on a woman then do as Almost40 said...
Originally Posted by Almost40
If you think a pussy will be smelly, try this: just slip in a finger or two and try to smell it. Then youll know if you are going further down.
It's called the sniff check. LOL.