Lady Margaery
Was Lady Margaery a virgin prior to her wedding night with Tommen? Renly never touched her, and Joffrey never got the chance too. I remember a conversation with Sansa where Margaery explains how Tyrion's "experience" might make him a suitable husband. Sansa is little taken aback by Margaery's knowledge on the topic, and naively ask if Margaery's mother had taught her this. Margaery just smiles and says "Yes, sweet child, my mother."
share