^^Now the cleaners have started doing the odd day, why not liven up the experience with a danger wank?
When you hear them coming down the corridor, flop it out and get going. The aim, of course, is to spunk your load before they walk in and catch you, ahem, red-handed, so to speak.
You can also extend the danger wank for the nurse's appearance and in other situations like when the gardener's coming up the drive etc.
And it's a bit of exercise too, so you can kill two birds with one stone!