There are moments when your heroes fall from the pedestal... and then there are moments when the fact that they're human makes them all the more precious to you.

If you accept the word of Michael Moorcock (of the Elric fantasy saga, among many others), Arthur C. Clarke was gay.

Go to ACC's Wikipedia entry and down to the last three paragraphs of the "Biography" section for the citation. There is also a link to the newspaper article written by Michael Moorcock which states this fact. (Citation 24)

"No, merely mildly cheerful."

Sir Arthur's reply when asked if he was gay by journalists. I can hear him saying it in my head, and practically see him grinning as he does.