Third. Surely a child of her intelligence should have started earlier. Admittedly, Sherlock knew little of children, but he had started school at three. Added to the fact she had clearly taken care of herself, it didn't paint a very flattering picture of her parents.
"Oh. Yes." He hadn't considered that. "You are probably from slightly before my time. I miscalculated. Some men form emotional and sexual bonds with other men. Oh, and women can do the same with other women. It's called homosexuality, though it seems to me rather pointless to attempt to categorise such things, attraction is attraction. It has been historically frowned upon, seen as a taboo and even a criminal offense. Where I come from it is finally gaining more widespread acceptance, at least in some parts of the world. I call John my husband, but we haven't legally been married since we are stuck on this ship. And when we do get home we will technically be 'civil partners' but 'husband' is so much easier to say."