There's a BIG difference between a connection and a CORRELATION and actual CAUSATION, which you initially seemed to be talking about (you said "directly create"). Because I would likely agree that some other conservative policy could cause higher teen preg rates - an anti-knowledge policy where young people were denied info on contraception, the "abstinence-only" policies which I referred to above, for instance - but simply making the AGE OF CONSENT (to sex) lower, I don't see how that would lower teen pregnancy rates. Maybe I'm drawing too fine of a distinction for you to get my point here, but I think it's an important distinction.
We could make the age of consent 21, but still tell high school freshmen everything they'd ever want to know about birth control, and make such birth control as easy to acquire as lollipops, and the teen preg rates could still plummet, even if all of those teens were engaging in technically illegal sex.
And btw, no, I'm NOT proposing 21 as an age of consent. But 21 to be in porn, I think that's worth considering...