This is indeed true, BB, but in my defence we were in a water theme park at the time, lying on the jacuzzi beds, surrounded by people grinning and dying to hear what I would say next.
He is still baffled because we told him later but he can't quite make sense of the mechanics of sex. Thank god. However thanks to the graphic midwife book we got lent he knows how the end product happens.
Anyway, off to bed now. Night night everyone.