Oh yes. A sergeant is very good at telling these things; it's how I ranked up, knowing which ladies are takers or not. [he grins, and joking aside, he's pretty honest.] The problem is, guys take forever to get a clue. You'd probably be able to deal with an entire city of vampires before it clicks.

And that's around the time you should pull a Cher and slap 'em upside the head.