Aragorn: “Hey Frodo how’s your gay uncle?”
Frodo: “Who, Bilbo? Bilbo isn’t gay. He’s just an eccentric lifelong bachelor who’s very particular about his jewelry and could only be coaxed away from his vintage housewares to go on an ‘adventure’ with about a dozen buff dwarves.”

Aragorn: “...”
Frodo: “Fun fact about dwarves by the way! According to Bilbo, there are so few dwarf women that only ⅓ of the men ever marry. The other ⅔ just get really, really into metalworking and are completely celibate for their entire lives!”
Aragorn:

I’m sorry Tolkien but if you’re gonna make a world that is ~canonically short on women, not just short on women characters, it’s a real gay world

Also at one point in The Desolation of Smaug movie Thorin tells Killi “when you’re king someday you will understand” which implies that Thorin envisioned himself dying childless even after he re-established the kingdom of Erebor soooooooo