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MIAMI (CBSMiami) – A new report highlights the intense pressure on young women to share nude photos of themselves.

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Researchers at Northwestern University analyzed nearly 500 stories on an anti-cyberbullying and sexting campaign’s website.

Two-thirds of girls aged 12 through 18 said they had been asked for explicit images.

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Researchers say the girls faced “persistent requests, anger and threats” from boys to send those images.

Psychologist and CBS News contributor Lisa Damour writes about the study this morning in a New York Times article called “Teenagers, Stop Asking For Nude Photos.”

She says it’s time to, “recalibrate some of the toxic norms that have taken hold among teenagers.”

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Damour says the problem is starting before the teen years and a conversation like this may have to happen just as soon as you give them a phone.