Rowling revealed that Dumbledore is/was gay for Grindelwald. Not very surprising really, many geniuses in history have been gay, bisexual, or have had ambiguous sexual preference. To name some: Leonardo da Vinci, Socrates, Henry James, Truman Capote, E. M. Forster, Oscar Wilde, Tennessee Williams, and William Shakespeare.

Here's the full article for those who care:
http://www.starpulse.com/news/index.php/2007/10/20/harry_potter_author_reveals_that_dumbled [1]