"Notes" joke

John woke up one morning with an enormous erection, so he turned over to his wife's side of the bed. His wife, Heather, had already awakened, though, and was downstairs preparing breakfast in the kitchen. Afraid that he might spoil things by getting up, John wrote a note, called to his little boy, and asked him to bring the note to his wife. It read:
The tent pole is up,
The canvas is spread,
The hell with breakfast,
Come back to bed.
Heather answered the note with one of her own and asked her son to take it to her husband. The note read:
Take the tent pole down,
Put the canvas away,
The monkey had a hemorrhage,
No circus today.
John read the note and scribbled a reply. He asked his son to take it to his wife. The note read:
The tent pole's still up,
And the canvas still spread,
So drop what you're doing,
And come give me some head.
Heather answered the note and asked her son to deliver it to her husband. The note read:
I'm sure that your pole's
The best in the land.
But I'm busy right now,
So do it by hand!