Most teen pregnancies happen because contraception fails. Most teens who get pregnant have been having sex for a long time. About one in ten girls become pregnant at least once before age 20. In most states, teens need their parents' permisssion to get contraception. Sex is the best way to prove you love someone.
Most teens talk about sex before doing it.
Not everybody's doing it. So despite what you see on TV, we aren't all sex-hungry maniacs. Most teens use condoms the first time. Way to go. They drop the ball later.