We all know the set up.
Girl cuts her hair, binds her breasts and wears baggy clothes to pass as a boy, it has even been seen in a contemporary settings. At some point she is outed, sometimes because some boy on the team saw she had girly nether bits. This usually leads to "she didn't need to hide/she's as good as any boy" but proposing it was a boy, just a /castrated/ one who had to get the medical equivalent of a vagina to be able to go to the bathroom.

would the boy pretends he's a girl? Reveal the truth? Would his team believe him? discuss.