User blog comment:12th Supernova/Hunger Games: Day One Review/@comment-4729061-20150729203302/@comment-3203286-20150729205418

Well, you're the only one to put this much effort into it.

But as an answer, and as a man with an equally impressive beard, let me explain. Each district has a pair. Since all but like two of the participants are male, each district just generically has one male and one female. It's the luck of the draw, I'm afraid.