Because, let’s face it: their version is a lot more accurate. Those with delicate constitutions may wish to avert their eyes:
— Ben White (@morningmoneyben) December 21, 2013
PS: In case you’re wondering… the difference between ‘screwing the duck’ and ‘screwing the pooch’ is, I imagine, largely a difference in just how ridiculous one looks while doing it. I would not actually know, having no real-life experience in either.