Dude, they taught it in my kids school, so please don't tell me they didn't when you weren't there.
That part I can agree with, but your statement was general.
I guess, so was mine. 
It wasn't taught that youth sex was wrong in my school, nor anyone that I
personally know either. I was taught that we should wait until we were adults. I know, I'm generalizing too, but I'm sure the latter is more accurate.
So, without going too far on this tangent, I'll restate my opposition to the ban--even though I can see where you're coming from: some couples that break up may want to return the child. I feel that would be a minority. I'd need to see statistics.
I know of a guy that adopted the daughter of his wife's brother, and keep her after they divorced.
As far as adoption laws, I feel they need to be relaxed. We will not find a "perfect" family, and in our search to do so, we're causing children to feel like they're not wanted. I can agree with doing criminal background checks, and looking at the family's income (to a point), but not this.