'Here are some of the ways mummies and daddies fit together'.
I'm no prude. But jeez, I just don't want to have to explain all that bit to my 4yo just yet
And it does rather set the bar quite high, doesn't it? Balloons? Bicycles? Stars and flowers? The mummies and daddies I know are more likely to do the whole 'wake me up when you're done; I've got to get up a 6' kind of fitting together