I have a question for vampire mythology fans. No young kids allowed.?

In the Buffy/Angel mythology specifically, vampires do have blood of their own (which is important, because in the "Buffyverse," in order for a vampire to "sire" another, they need to feed the victim some of their own blood). They don't have a working heart, so how the blood is transported down "there" is not readily explained (other than, for the amount of intimate relations the Buffy/Angel kind of vampires have, it obviously gets there SOMEhow). As far as the baby thing is concerned, in that specific case, a whole lotta magic and prophecy and whatnot was involved, because in that specific "universe" it's -supposed- to be impossible for a vampire to procreate via the "usual method" (i.e., sex).