The hours between and p.m., when many parents are still at work, are prime time for trouble.
Researchers at the RAND Corporation have found that teens are more likely to have sex when there is less after-school supervision.
"He pulls in and gets on his cell phone and says, ‘I'm here,'" Beck recalls.
"I said to my daughter, ‘Tell him he needs to come in.
And ask your teen to think about what she would do if she weren't in a group, says Sabrina Weill, author of The Real Truth About Teens and Sex.