More than a quarter of young people in the U.S. are "sexting," a new AP-MTV poll has found.

Here are the sobering stats:

• 30% of 14- to 24-year-olds surveyed say they've been involved in some type of sexting

• 29% say someone they know has sent them messages with sexual words

• 18% say someone has sent them naked pictures or videos of themselves

• 8% say someone sent them naked pictures or videos of someone else that they know personally

• 7% say they've participated in a webcam chat during which someone else performed sexual activities

• Those who sent nude pictures of themselves mostly said they went to a boyfriend, girlfriend, or romantic interest

• 14% said they suspect the pictures were shared without permission

• 17% of those who received naked pictures said they passed them along to someone else, often to more than just one person

• 10% said they had sent naked pictures of themselves on their cell phone or online

Yesterday, we told you about Hope Witsell, the 13-year-old who hanged herself after a topless photo she sent to a boy was forwarded all over town.

How do you stop YOUR kid from sexting? Help!