Yeesh... Some people on this thread...
The stories are over. This never appeared in the books. Children will never read it in the books, as it was never really referred to. It does fill in a question mark on Dumbledore’s old friendship, but even as an adult reader I hadn’t realized the question mark was there until I read this quote. Even Rowling acknowledges this was an un-requited (aka it never happened) relationship.
Therefore, I think we have better things to worry about than the non-escapades of a celibate fictional character. It isn’t really relevant. Rowling didn’t feel the need to include it in the books, and only mentioned it here in response to a direct question.
It’s her personal interpretation of the character. The nice thing about reading is we can all gather our own interpretations.
My life is so dull this is all I can find to worry about