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this article seems to think so
http://io9.com/371200/sinestro-will-...re-for-victory
here is a excerpt
I personally agree with the final thought on the article
He has an powerful, intense, crafty mind. He's the equal or better of most GLs, because he was one, and he's set himself against all 3600 of them. It's the life-choice of a man with an immense ego and grandiose imagination, who has no respect for conventional boundaries. His one overriding, single-minded goal is winning
http://io9.com/371200/sinestro-will-...re-for-victory
here is a excerpt
We've been wondering for a while about Sinestro's sexuality. The fascistic alien conqueror, from DC Comics' Green Lantern series, sports a neat little mustache and a costume that's skin-tight and unusually heavy on the gold lamé, even by superhero/supervillain standards. And then we discovered a page from an old Green Lantern comic that made our sex questions even more pressing — and so we decided to talk to the comic's writer and shed some light on what makes Sinestro happy.
I personally agree with the final thought on the article
He has an powerful, intense, crafty mind. He's the equal or better of most GLs, because he was one, and he's set himself against all 3600 of them. It's the life-choice of a man with an immense ego and grandiose imagination, who has no respect for conventional boundaries. His one overriding, single-minded goal is winning
.........................WTF 
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