First part:
I believe we are born blank slate, but pick things up quickly there after.
Second:
Biologically its a good idea. We've been breed for thousands of years to do just that. Only in the last few hundred years has the idea been frowned upon. Humans peck sexually between 14-25 so biologically that's the way you're wired.
In today's society people should be allowed to breed though unless they past an intelligence test. An trust me there are two or three generations that we need to just go ahead and skip.