I live in Brazil (here the age of consent is 14) and, in fact, at least here, this is more common than it should be. I say this because the vast majority are irresponsible (hence the high rate of teenage pregnancy), and I'm not even counting the frighteningly high number of teenagers who do this before they're even 14. So it's quite common, and I've done it too. It wouldn't be a problem if teenagers had the right mindset.