This isn't just about teenagers shagging other teenagers, guys. If you make the age of consent, say, 13, that means a 30 year old could legally have sex with a 13-year-old. And that is just not on. No way, no how.
Yes, people are going to do what they're going to do and if a young couple want to get it on, whatever. Personally, I think it's in their best interests to wait, as I think sex has become drastically devalued in recent years, but that's just my opinion. But let's not open the door to creepiness, shall we?