1 in 4 teens say they're sexting

73% of teenagers today have a smartphone, giving them access to all types of communication over text or social media. For many kids, that includes sexting—the sharing of sexual messages, images or videos—according to a new study.

The new report, published in JAMA Pediatrics, analyzed 39 studies with a total of about 10,300 young men and women under age 18. It found that sexting has become increasingly more common in recent years. Though the majority of teenagers don’t report sexting, 15% of teens say they send sexts and 27% receive them. The activity is also more common as young people get older, the study authors report.

“The topic is of pressing concern for most parents, who are faced with the double threat of trying to understand the workings of the digital world, while also having to navigate conversations around sexual behavior with their teens,” says study author Sheri Madigan, an assistant professor in the department of psychology at the Alberta Children’s Hospital Research Institute at the University of Calgary in Canada.