In the survey, 81 percent of girls 14 to 19 said they had at least one friend who had been asked by a boy for a sexy or naked photo. “They ask all the time,” Sally said. “But I’m like, no thanks, I’m not like that.”

Deborah Tolman, a psychology professor at the City University of New York who researches adolescent sexuality, said: “This is the contradiction we put in front of girls: You should be confident and do well in school and do athletics, but you’re supposed to also be a good sex object at the same time.”

Isabelle said romance was the exception to the equality she felt at school and in life. Recently, she rejected a boy who had been flirting with her on text and social media.

“He got ridiculously mad; he called me names, used slurs,” she said. “When we get rejected, we don’t explode just because they don’t like us back. Guys just feel more privileged.”

Adolescents feel these pressures worldwide, found the Global Early Adolescent Study by Johns Hopkins and the World Health Organization. “We were stunned — and I’m not easily stunned, as a clinician working 40 years with adolescents — at the hyper-sexualization of young kids,” said Robert Blum, the study’s principal investigator and a public health professor at Johns Hopkins.