And first of all, daddy and little boy got up to play. The camera closed in on little boy's hairless body, and pointed out the relevant bits. Then we panned across to daddy, who was huge and had a beard and a back-hair problem, and it was pointed out that his bits were larger. Then the same was done with mummy and little girl, and we were told about "changes" that happen when you make the sudden transition from little boy to daddy, or little girl to mummy.
There was a quick (half a minute at the most) segment about the fact that when mummy and daddy want to have babies they have to "become very close", and... that was it!
To be honest it just made me wish I would never grow up.
I've never liked back hair.