No, you're right. She says "Once would have been nice." and Sherlock replies, sort of sheepishly, "I was waiting until we were married." "We both know that wasn't going to happen."

That's why the newspaper articles that she showed him were so funny, because they said things like "Hot Blooded Detective!" And "Seven Times a Night!"...which was only amusing because they hadn't had sex at all, and that was her 'revenge' of a sort

I like the prompt idea though, despite this. :)