Because it would end embarrassing mistakes like this one.
A group of teenagers misunderstood a woman's screams during sex and, thinking they were stopping an assault, beat a 25-year-old man in her bedroom, police said.
Multiple tragedies here: not only was an innocent man beat up, but now everyone at school is so going to know those teenagers are like total virgins.
More like this
Science Cafe on Teenage Brains :
Language Log details the results of this fascinating experiment.
Beebs reports of the recent case here in the UK. A school girl joins a chastity club and wears a ring that marks her chastity to school. School asks her not to be so snotty and chastizes (oh, sweet pun) her.
First of all, it is not "your teenager" and if that is how you view the teenager, you've totally lost. Second, remember the ultimate truth that you knew when you were a teenager and that "your" teenager knows now: Teenagers know things that adults don't understand.