Teenagers are stupid

And no, it's not just teenage boys, either, though they probably do the majority of stupid teenage shit. Sometimes, the girls have a common sense FAIL, too:

An Australian activist has warned teenage girls in the country to refrain from writing their phone numbers on their backs while sunbathing.

Girls, ages 14 and 15, have been spotted sunbathing at Sydney beaches with their phone numbers written on their backs in blue zinc cream in what they described as an attempt to meet boys, the Daily Mail reported Tuesday.

Concerned adult Nikki Goldstein said it is dangerous for girls to display their "phone number on the Internet or anywhere that could make them a target."

[...]

One of the sunbathing girls, Lizzy, 15, said the plan she hatched with her friends to meet boys has already backfired in a menacing way.

"An old guy tried to talk to me. He was trying to take pictures of us," she said.

No, you don't say. I mean, here you've put a sign on your back that might as well read "Please, feel free to call my home and breathe heavily into the phone as you masturbate," and you attracted the attention of some creepy old perv? Who could've possibly seen that coming?