From left to right: Alan Davies, Rich Hall, Stephen Fry, Phill Jupitus, Jeremy Clarkson, and Bill Bailey.
Based on some silly jokes between a friend and I about how Stephen Fry is always talking about never getting laid, even though the "QI" show seems to be making his straight contestants bi-curious. Phill Jupitus often try to flirt with Fry, but Fry either turns him down or acts innocently oblivious to it.
While the text isn't 100% correct, it's all based on things they said on the show.
EDIT: Haha! I've been informed that Phill Jupitus have seen the picture and liked it, so I feel less guilty now.
EDIT: Aaaaand Stephen Fry himself tweeted about the picture, so now all is right in the world for me.
EDIT: Aaaaaaaaaaaand Alan Davies retweeted it.