You can't move on social media or in an airport novel for mentions of "the boy", that mythical perfect boyfriend who gets their partner's eyes and tweets all a-flutter. "Meeting the boy for drinks later," they coo, as they skip down to whichever chichi future-dive their beau is sitting in, batting his sweet little eyes at the rest of the clientele. But who is The Boy? How do you get to be one? What does he do? Much like the "Cool Girl", "The Boy" is a fantasy of perfection. In...