J.K. Rowling Hints at Revealing Dumbledore's Sexuality in Future ‘Fantastic Beasts’ Films 

We already know that he likes men, what else is there to it?
*Gods, I'm tired*

Yeah, I know.

Still, even though JK has literally said it herself, people do deny it so long as it's not been confirmed in any of her stories. Probably about time it was in her work so that fans can stop denying canon stuff. XD

^I do have a friend who does this, it's true.
But it's mostly because he was raised to believe homosexuality is evil and he takes any conceivable little wiggle room to try and deny it.
Still being quite the sook about it, all these years later.