As a lover of both books and sex, I hated those.
But there was a hilarious post on the 'six weeks board' a while back with many, many girls saying how their baby was conceived after 50s and how they were going to name the baby after the lead character *rolls eyes*
Here:
http://community.thebump.com/cs/ks/forums/thread/67100378.aspx
Sorry, can't make it clicky.