I'm going to say no. I'm thinking if you make it sound to kids like the miracle it is, then you might get them taking more risks. I mean how fluky have to got to be to get al the factors right, you could imagine kids thinking of taking the risk of unprotected sex because the chances of getting pregnant dont seem very high.
Also, from reading that Toni Weschler book, most people are still told these days that you ovulate around day 14 and this isn't true with most. If a teenager takes this 'factoid' for granted, surely it means that you won't get pregnant if you have unprotected sex on days 1-13 and 15 - 28?
I think keep a little of the mystery in there to make them fear it could happen to them.
I, however, could use some learnin'!