Caroline Mullet, a ninth grader at Issaquah High School near Seattle, went to her first homecoming dance last fall, a James Bond-themed bash with blackjack tables attended by hundreds of girls dressed up in party frocks.

A few weeks later, she and other female students learned that a male classmate was circulating fake nude images of girls who had attended the dance, sexually explicit pictures that he had fabricated using an artificial intelligence app designed to automatically “strip” clothed photos of real girls and women.