"Tent Pole" joke

Jim woke up one morning and turned over to his wife's side of the bed, but she had already gone downstairs to the kitchen to prepare breakfast. Fearful of spoiling 'the moment' by getting up, he called his little boy into the room and asked him to take a note to his wife. The note read:
The Tent Pole Is Up,
The Canvas Is Spread,
The Hell With Breakfast,
Come Back To Bed.
His wife answered the note 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.
Jim quickly read the note and wrote a reply, which he asked his son to take 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.
His wife read the note and again asked her son to take her reply back 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!