Sansa? I never found her sexy, but each to their own. Uptight and has no soul.

It's a tough question though. To be honest my memory's a bit hazy because it's taking so bloody long for a new season. I'll have to rule out Arya Stark because it would feel wrong and I'm no Peter File.
The obvious pick would be Daenerys Targaryen and I think I'll choose her through process of elimination really. I find Cersei annoying and ugly. Margaery always looks like she's stoned which isn't so sexy.
Wait a minute... Shae, Tyrion's prostitute. Eventually I disliked her character, but she's sexier than Daenerys so I'll pick her.