Explaining to kids where babies come from - 70's style

If you are unsure about what to say when your children ask you where babies come from ... try the 70s style "tell it like it is" comic series that is currently doing the rounds as a viral email. The images (I believe) were taken from a popular book published in the 70s which parents could use to explain the facts of life to their children. I haven't seen any recent books that are trying to do the same but surely the original work is a land mark in publishing and education!
Have a look:

But wait ... it gets better ... (if you are offended by explicit comic sex ... don't click on "read more")