"Horse race" joke

The horses in the race...
Passionate Lady
Clean Sheets
Bare Belly
Thighs
Silk Panties
Big Johnson
Conscience
Heavy Bosom
Jockey Shorts
Merry Cherry
At the Post...
They're off! Conscience is left behind at the post.
Jockey Shorts and Silk Panties are off in a hurry.
Heavy Bosom is being pressured.
Passionate Lady is caught between Thighs and Big Johnson in a very tight spot.
At the Halfway Mark...
It's Bare Belly on top.
Thighs opens up and Big Johnson is pressed in.
Heavy Bosom is being pushed hard against Clean Sheets.
Passionate Lady and Thighs are working hard on Bare Belly.
Bare Belly is under terrific pressure from Big Johnson.
At the Stretch...
Merry Cherry cracks under the strain. Big Johnson is making a final drive.
Passionate Lady is coming.
At the Finish...
It's Big Johnson giving everything he's got and Passionate Lady takes everything Big Johnson has to offer.
It looks like a dead heat but Big Johnson squirts through and wins by a head.
Heavy Bosom weakens and Thighs pull up.
Clean Sheets never had a chance...