[quote name='eurenix']
http://www.tvtome.com/Munsters/season1.html
Look at episode 4. Clearly at least Herman and Grandpa believe in vampire reproduction. While they might be able to trick Herman with "Didn't you notice I was pregnant for nine months you clod!?", I doubt Grandpa would be quite so easily fooled. But I love the whole "Home for lycanthropily(sp?) disgraced young women" concept.
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Let us not forget that Grandpa is hopelessly senile ( raising an issue about vampire longevity but perhaps he was already a lot cause when turned) and Herman is, putting it mildly, a retard. Between them they no doubt share any number of cherished beliefs based entirely in fantasy.
Some of it is denial of what passes for their lives. Consider the problems of how a female vampire would gestate a non-vampiric fetus. Supposing she wasn't simply barren as a rule, just keeping her body temperature at a level to allow conception and sustain that through birth would be a difficult undertaking. Almost on a par with the reproductive trials detailed by Larry Niven in 'Man of Steel, Woman of Kleenex.'
http://www.larryniven.org/stories/Man_of_Steel_Woman_of_Kleenex.htm
It helps if you have necrophiliac tendencies, which would be perfectly understandable in an entity like Herman. It also helps if you're prospective undead subject is a young Yvonne DeCarlo. She was 42 when the Munsters first started but since Eddie was 11 at that point then she may have looked like this when she first met Herman:
http://www.briansdriveintheater.com/yvonnedecarlo.html
OTOH, that puts us back in the realm of vampiric aging. Alternatively, she was turned at 42 and has had the same appearance throughout her relationship with Herman. This raises the question whether she was pre-menopausal on top of whether becoming a vampire doesn't render the reproductive plumbing inert as part of changing to a different species with a completely different reproductive technique. Assuming she was still capable of reproduction int he mammalian mode, can she do this with a human rather than another vampire? Even a composite human like Herman presumably produces conventional sperm, also presumably carrying the specific DNA of his testes' original owner.
Now then, we have another problem. Can Herman not be shooting blanks after his gonad have spent who knows how long in an inert decompositional state before collective ressurection as part of Herman? Can Lily produce a viable egg at her advanced age and becoming a vampire adding insult to injury? If these obstacles are not insurmountable, we can expect that switching on the electric mattress pad is the opening gesture of foreplay in the Munster budoir.
A large number of congenital defects have been found to increase in frequency as the parents age. Most of these produce cognitive retardation but can also be seen in a variety of physical deformities. These can include misformed or oversized ears, a recessed jaw making the upper canine overly prominent, and excessive hair growth. We start to see a set of symptoms that describe the Munster offspring. Poor Eddie appears to have evaded any severe retardation but this might only be an illusion caused by the cognitive shortcomings of his parents and other family members.