If you want an exercise in suspending belief, try this: http://www.bbc.co.uk/news/magazine-22152700
Allegedly the ultra-orthodox Jews, despite thousands of years of practice, are still unable to find out how to procreate and need a book to help them. “We wanted to give people a sense of not only where to put their sexual organs, but where to put their arms and legs,” the author says. “If you have never seen a movie, never read a book, how are you supposed to know what you do?” Well, sir, as a former schoolboy in the late ’40s and ’50s, I can’t remember my contemporaries ever being uncertain about the positions employed, despite a total lack of access to films or books on the subject. You put the right one in, the right one out, the right one in and you shake it all about. You do the okey kokey and you turn around. That’s what it’s all about. Remember, son?
Go forth and multiply, I say.
Boadicea's Chariot 
I read a few years ago that the guy who wrote Hokey Kokey had died. According to the obituary, when the undertakers went to place him in his coffin they put the left leg in and all hell broke loose.
Taxi!!
OZ
This story was doing the rounds here some time ago.
Considering their diaspora to every known corner of the earth I think they must just have had an inkling of how to do it!
OZ, you know the posh version obviously – Hokey, eh? 😉
Dead posh, me.
OZ