[Boaz]

I don't know. I wish I did. It's another enigma.

I personally think that Margaery is exactly what she appears. A pretty girl with a good head on her shoulders and tutored by her grandmother to be a player, yet still just a girl who wants to be a fun loving teenager.

Edit: Okay, I found another possible reference or mayhaps just a red herring... Pages 347-8.

Read Cersei's and Osmund's conversation with Margaery as a lesbian in mind. I'll give you the highlights...

Cersei: I am running short of patience with dear Osney. He should have plucked the rose by now. Is the little queen blind to his charms?

Osmund: His charms is fine. He's a Kettleblack, ain't he? It's her that's the trouble... They are never alone. Two of her ladies share her bed...

Yes, it's extremely weak, but since Cersei seems to be leaving her first instincts and missing the target... well, it makes me like the idea.