Statistically unlikely

It had been about five years since the Great Shift. It had seemed statistically unlikely, but all of Fred's closet male friends had swapped with women. Fred, too, had become a woman thanks to the Shift. They had all adapted to their feminine roles quite well. In fact, it was Fred who had the hardest time with it. All the others had gotten married and become pregnant. Fred was a few months behind them. He had finally accepted he was a woman now and finally settled down. He'd be joining his friends in motherhood soon enough.