Board Thread:Books/@comment-867021-20121212150631/@comment-3048593-20121213164449

Well it's according to Moorcock that Clarke was Bi:

"Everyone knew he was gay. In the 1950s I'd go out drinking with his boyfriend. We met his proteges, western and eastern, and their families, people who had only the most generous praise for his kindness. Self-absorbed he might be, and a teetotaller, but an impeccable gent through and through."

I'm not too familiar with Heinlein's works to be honest. The only thing of his that I've read is his short-story "—All You Zombies—", the one about a person who's a living predestination paradox.