That's Not Even the Best Sex-With-Horses Story This Year
A previous guy explained his man-on-horse action as an attempt to create a new race of super horse-men.
“I was trying to make the horse have a baby,” Mendoza explained. “I was thinking it would have a horseman baby.”
See the link for an artist's conception of what that might look like. The super race of horse-men, I mean, not the act of procreation.