Yes. Vampires can smell menstruation. Vampires will often sneak into public female restrooms, take the tampons out of the receptacles, and suck on them like lollipops.
No. Aliens are people from another country who have retained their citizenship in the other country.
Aliens as entities from outer space have not been shown to exist.
No. What vampires are really after is not blood but life-energy. There are vampires that don't even drink blood but have found a way to steal life-energy without it. So drinking the blood of a dead...