Abstinence-only "sex ed" doesn't work. Teenagers are going to have sex no matter what they're told by adults, so the choice is to give them good information or not. Giving them no information about birth control (or false information, as many abstinence-only programs have been found to do) just leaves them unprepared. That generally affects them through their adult years, as well.

(Sexual consent laws are not nearly as uniform as you claim, either. Laws defining appropriate age ranges for sexual conduct for minors, e.g. it's okay for a 16-year-old to have sex with a 17-year-old but not a 40-year-old, are not uncommon. This is utterly tangential to the actual point, though.)

If the "pro-life" movement realistically wanted to eliminate abortion, they would fund research into improving things like Implanon so that everyone would get an implant when they turned X (12, 14, 16, whatever) and no one could get pregnant or get someone pregnant unintentionally. That is a solution that actually acknowledges reality and works within it. Railing against Planned Parenthood and "marching for life" are not solutions.

(The BBC article you cite about failures of Implanon does not contradict my statement that it has a sub-1% failure rate. (600+1600)/4100000 = 0.05%. No other birth control on the market does that well. Yes, it has side effects; all hormonal treatments do. Also, the implantation problem has been corrected with the updated version, called Nexplanon.)

The "pro-life" movement ultimately stems from the feeling, generally religiously inspired, that pregnancy must be a necessary consequence of sex. The idea that we could separate the two is what most of the movement actually opposes. Women who have sex out of wedlock should be punished by having to carry the pregnancy to term. Those are the oppressive sexual mores to which I referred. (Interpreting that as "locking up your kids"-style oppression was not a high point of your reply.)

If they really felt that a single-celled zygote is morally equivalent to a person and abortion is murder, they would not act they way they do. Murder is a more important issue than birth control or teenage sex. Also, most pregnancies end in miscarriage, without the woman even knowing she was pregnant; a "pro-lifer" ought to see this as an epidemic. I have almost never encountered any who realize this, let alone try to do anything about it. (Every once in a while, some state legislator ends up trying to criminalize miscarriages, and quickly gets eaten alive in the public eye.)

I'll try to keep an eye out for your NB.