What percentage of girls were sharing nudes? I asked. “Twenty . . . thirty?” they guessed. “The thing is, with boys,” Cassy said, “if you don’t send them nudes, they say you’re a prude.” “Or scared,” said Maggie. Had a boy ever asked them for nudes? I asked. “Yes,” they said. “They blackmail you,” Cassy said. “They say, Oh, I have embarrassing pictures of you, if you don’t send nudes I’ll send them all out on social media.”