"Fart Football" joke

The
old folks no sooner hit the pillows when the old man
passes gas and says, "Seven Points," his wife
rolls over and says, "what in the world was that?"
The old man replied, "It's fart football."
A few minutes later his wife lets one go and says
"Touchdown, tie score."
After about five minutes the old man lets another
one go and says, "Aha. I'm ahead 14 to 7."
Not to be outdone the wife rips out another one and
says, "Touchdown, tie score."
Five seconds go by and she lets out a little squeaker
and says,"Field goal, I lead 17 to 14."
Now the pressures on the old man. He refuses to get
beat by a woman, so he strains real hard. Since defeat
is totally unacceptable, he gives it everything he's
got, and accidentally poops in the bed.
The wife says, "What the hell was that?"
The old man says, "Half time, switch sides."