"A Day at the Races" joke

Horses in the race are:
1. Passionate Lady
2. Bare Belly
3. Silk Panties
4. Conscience
5. Jockey Shorts
6. Clean Sheets
7. Thighs
8. Big Dick
9. Heavy Bosom
10. Merry Cherry
At the Post:
And 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 Dick is in a very dangerous spot.
At the Halfway Mark:
It's Bare Belly on top. Thighs open and Big Dick 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 Dick.
At the Stretch:
Merry Cherry cracks under the strain. Big Dick is making a final drive. Bare Belly is in and Passionate Lady is coming.
At the Finish:
It's Big Dick giving everything he's got and Passionate Lady takes everything Big Dick has to offer. It looks like a dead heat but Big Dick comes through with one final squirt and wins by a head. Bare Belly shows. Thighs weakens, and Heavy Bosom pulls up. Clean Sheets never had a chance.