The question is asked and the interpretation desired, for the same reason so many tried to shoehorn
Tom Cruise into being gay, and on and on it goes.
Just as (for a time) it didn't matter what Tom Cruise said about his own sexuality, so it doesn't matter to some what
Tolkien said about his characters.
An author's intent has absolutely no bearing on the "legitimate interpretation" of his characters. Others get to tell us what the text and author says and meant.
That said, those who WANT to find something else there, WILL find something else there... and for them, it is perfectly 'legitimate'. Why? Because they want it to be (in spite of the facts.)
Now... let's explore another very real reason such questions come to the fore.
It has nothing to do with the author, or the text, or the truth whatsoever.
It is best understood as the "reaching out...the probing...to find "like minded people." This is how acquaintances, friendships, cliques and more form. It's not about "the author or the book." It's about the SEEKER - and the question itself is but a ruse.
Now... if Tolkien had said "every fantasy MUST contain the elements of sexuality of every kind...just not overtly" I would be inclined to pursue how he had folded them in.
But he didn't. He DID say it must contain the elements of morality and religion... and for this reason I very much pursue how he folded all that in... and he's done so magnificently. Most can't even see most of it. (Which he also said.... "most of my readers simply will not understand my work.")
Whether he included elements of sexuality of any kind doesn't even rise to the level of whether
Balrogs have wings, or why the
Eagles didn't just fly
the ring to
Mordor.
But the issue of sexuality will not go away. Not because it's there... (it just isn't, folks)... but because people WANT it to be there... and if the human is good at anything, it's at manufacturing what's needed for self-gratification.