In my logic it would mean that, regardless of age, if a sexually mature boy/girl decides to have sex with someone, they're ready. I rather doubt a 9 yo would wake up one morning going "gee, that virginity thing is overrated, time to lose it by bed time tonight" The same goes for most (if by no means all) 13 yo's. But at some point in time hormones will take over, and sex is gonna happen. I fail to see how imposing some arbitrary age of consent by law would change that (or how this would somehow protect "the children" for that matter).
As for the correctness of my opinion, it's just that: an opinion. And i stand by it, regardless of what jesus, mohammed, Jahweh or Budda has to say about it. None the less, i don't see you disproving my statement that consensus on the actual age of consent (as most other laws regarding sex) is rooted in culture and religion, not some enlightened idea of being sexually (or otherwise) mature. Otherwise we wouldn't see such diversity of regulations throughout time or geography.