No, I haven't, though I'd like to. I bring up the Amish not because I think we need to reject technology in the way that they have--on the contrary, smartphones and the like make it easier than ever to keep track of your kid, which again, is one reason why rates of teenage sex are actually going sharply down. I just bring up the Amish as an undeniable concrete example of a society with proper sexual norms and a close-knit community. The claim that this somehow "isn't possible" is therefore objectively false.
I grew up in the American South in what I would call a mildly conservative environment. Church was a big part of life, most adults around me were probably Republicans (though being a child, I was apolitical and didn't pay attention to things like that yet), and underage sex was definitely considered sinful. I don't think I had any friends that had sex as teenagers. None that I can remember off the top of my head, at least. Despite this, people I knew in high school dated actively, smoked weed, etc., and I have no doubts some of the kids in that school were going at it. Just none of the ones in my more religious and relatively high-achieving circle.
My parents were definitely Christian and conservative, but do not fit the modern stereotype of bible-thumping tyrants. Going to church and youth group was mostly the extent of religion in our lives, more of a social center of sorts than anything else. Today, while they are still Trump voters, they support gay marriage and hold other viewpoints that I find incompatible with Christianity, and I'm far more conservative than they ever were. When I first began paying attention to politics, I was liberal at first, but this was simply because I had only ever been exposed to the liberal side of the story via the public education system.
As soon as I was exposed to coherent counter-viewpoints to liberalism, I changed my views quickly and easily, because the truth of these "conservative" views seemed self-evident to me.
Again, as I pointed out in the very passage you're replying to, teenage sex and pregnancy are actually at historic lows right now due to a variety of factors. Good ol' fornication has been replaced with other, possibly even more harmful forms of degeneracy for Gen Z (LGBT identification, especially trans, and porn addiction).