Hm... I'd probably call that a lore check for the WCV; it seems to fit the same sort of sensory ability a wizard has to detect magical talent, for example.
As for how likely you are to get eaten - that probably depends more on the rest of your character; if you've got, say, a high discipline and a bit of power, you should be just fine; if not, you're neither more nor less food than any other mortal.
It'd also vary depending on how likely you are to encounter WCVs - if your character isn't the sort who'd show up at clubs, for example, you'd be a lot safer than someone who is.
I'd also refer you to the sections on social conflicts and concessions; if a WCV *does* try to eat you, and you don't have the skill to avoid getting taken out, you can concede instead - the book example has someone taking a consequence of "doubting my purity", rather than actually ending up sleeping with anyone.
