As was mention in an earlier post Humans and Klingons do have kids together...
...but only by virtue of medical intervention, per "The Emissary" (TNG):
TROI: I didn't know it was possible for a human and a Klingon to produce a child.
K'EHLEYR: Actually, the DNA is compatible, with a fair amount of help.
Note that the two instances of natural conceptions we saw (Alexander and Miral) were from pairings where one parent was already a half-human/half-Klingon hybrid.
Can I ask a question while trying to keep in check my sarcastic tendencies? Is Klingon hair that big of a deal? I mean, we've had shaved head Klingons before so I'm struggling with why the lack of hair was the tipping point?
Acting concerns aside, as I can see that, even if I don't see it as a problem, this hair thing is a major sticking point that is baffling to me.
The issue with the purported notion of them being
naturally and
universally hairless—which was always a misunderstanding on the part of some reporters with respect to what the makeup designers said about positing an "evolutionary imperative" behind the new design (they were talking about the purpose of the
ridges, not the baldness)—is that it would have been the
one and only aspect of the redesign that would have actually affected previous stories. In "Schisms" (TNG), Worf visits the ship's barber, who revels in how thick and luxuriant and pleasurable to cut Klingon hair is; in "The Quality Of Life" (TNG), Worf speaks of beards being a symbol of courage to Klingons; in "Rightful Heir" (TNG), the myth of Kahless making the first
bat'leth from a lock of his hair is of significance; and in
Insurrection, accelerated hair growth is a symptom of Klingon puberty. So that's why it would have been a sticking point if they
were inherently hairless without explanation.
They’re not backpedaling, they’ve been saying before Season 1 even aired that they have hair.
Have they? You keep saying that, but I don't remember seeing the quote.
And I asked you to provide a citation for them saying that before or even during the first season.
Here you go:
"This is a group of Klingons who've gone back to a puritan way of life. They look very different: they wear armour that's 200 years old and they don't have any hair. Their commander runs his Klingon house—the house of T'Kuvma—by the rules of Kahless, the Klingon messiah."
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Ted Sullivan, SFX #292, 13 September 2017
Note also that Rejac's sarcophagus depicts hair, onscreen, in the very first episode:
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MMoM