Because once you're of age to reproduce, you're fair game.
Once you're of age to reproduce, you should fair game in the dating world. "Kids" younger than that used to take on much more adult rolls years ago, but we're so involved in coddling and sheltering kids these days that they're happy with spewing the "I'm just a kid" excuse well into their 20s. If you're worried about lowering the age limit because they cannot make such "adult decisions" then why is the age of consent 16 or younger in most places? 3 years doesn't make much of a difference to me. They look pretty much the same and damn sure aren't smarter in a lot of cases. We should be striving to prepare kids for these types of decisions earlier on so that they can choose for themselves if they want to engage in such activities. I find most girls will start losing their luster after about 21-30 years old anyways, so lowering age of consent standards will only help girls to find these aggrandized romances they've been so indoctrinated to seek out, and maybe they'll learn that there are more important things to focus on than all the lovey dovey, material romance BS promoted by the media. They'll also be that much more physically desirable for an even longer period of time. BTW I am not a pedophile. Pedophilia involves attraction towards prepubescent children, not young adults. I just happen to prefer my women unspoiled by age and cynicism.