So here is the answer to "Why didn't Tarzan have a beard?" The answer is "He shaved." I guess they didn't think it was significant enough to show it in the movies.
The things a person learns around hereEdgar Rice Burroughs » Tarzan of the Apes » Chapter 13 wrote:The young Lord Greystoke [Tarzan] was indeed a strange and war-like figure, his mass of black hair falling to his shoulders behind and cut with his hunting knife to a rude bang upon his forehead, that it might not fall before his eyes.
His straight and perfect figure, muscled as the best of the ancient Roman gladiators must have been muscled, and yet with the soft and sinuous curves of a Greek god, told at a glance the wondrous combination of enormous strength with suppleness and speed.
A personification, was Tarzan of the Apes, of the primitive man, the hunter, the warrior.
With the noble poise of his handsome head upon those broad shoulders, and the fire of life and intelligence in those fine, clear eyes, he might readily have typified some demigod of a wild and warlike bygone people of his ancient forest.
But of these things Tarzan did not think. He was worried because he had not clothing to indicate to all the jungle folks that he was a man and not an ape, and grave doubt often entered his mind as to whether he might not yet become an ape.
Was not hair commencing to grow upon his face? All the apes had hair upon theirs but the black men were entirely hairless, with very few exceptions.
True, he had seen pictures in his books of men with great masses of hair upon lip and cheek and chin, but, nevertheless, Tarzan was afraid. Almost daily he whetted his keen knife and scraped and whittled at his young beard to eradicate this degrading emblem of apehood.
And so he learned to shave--rudely and painfully, it is true--but, nevertheless, effectively.
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