I suspect the decrease in teen pregnancies has more to do with the popularity of anal sex. Used to be just Catholic girls used to whisper about "God's Loophole" for keeping their boyfriends from straying. These days it's all over the internet. Every teen in America knows about it. Really: That's not hyperbole.
Yeesh, normally I always say that I wish I was young again.
But if what you say is true, I'd be on a bummer trip for sure, dude.
Sorry but I've just never ever considered it as an option even on the rare occasions in my youth when it was presented as such.
Exit only, that's me!