I love how these stories does the funny thing of making the gender disorder seem like some kind of burden at the beginning of the story and by chapter 11, gurls just want to look great at the swimming pool.
But yeah, plot development for a new rival character.
And this chapter brings out one of the problems of living in a gender fluid society: trust in your partner. Because it basically means that if all males could just switch genders whenever they want the there aren't any more friends in the world, just potential mates. Everywhere. Stress level increase by 1000% in relationships. Monogamy would basically be pointless...