A MAN AND WOMAN ARE HAVING KISSING IN BED. SHE STOPS AND LOOKS INTO HIS EYES SUGGESTIVELY.
WOMAN
I want to try anal again.
THE MAN DOESN'T LOOK AS ENTHUSIASTIC.
MAN
Have you cleaned this time?
WOMAN
What? Yes, of course!
MAN
OK, I was just making sure. Because last time, y'know...
WOMAN
OK, ok, let's not go there. Don't ruin the mood.
MAN
Look, I'm just going to get a cloth and give it a wipe.
WOMAN
But...
MAN
Just to be on the safe side.
MAN EXITS AND RETURNS WITH INDUSTRIAL SIZED CLEANING EQUIPMENT.
END
I've just realised this joke only works if you know the title.
Any suggestions as where to slip it in, so to speak?