(CBS) – The first ever study on the “public health impact of sexting” shows close to 30 percent of teens send nude pictures of themselves via email or text.

Researchers looked at nearly 1,000 students in Texas and say nearly all the girls and half the boys who sent photos, sent them even though they really didn’t want to. The study also found teens who sent nude photos were more likely to have had sex compared to teens who don’t participate in sexting.