A horse is not just a horse of course

The are many deep dark secrets in Hollywood Babylon. Especially back in the sixties. There was Rock Hudson and Sal Mineo. Drug addicts like Dennis Hopper and Peter Fonda. But our show had the biggest problem of all. Wilbur was having sexual relations with Mr. Ed. 

No one could understand why Wilbur would leave such fine young nubile flesh like his young wife to hang out in a barn. Little did they know that he was a pony boy. A horse lover. An equine excess dabbler. A stallion straddler. Wilbur really loved his pony. 

That is why he could only hang out with celebrities who had secrets of their own. Like Sandy. It was a time of shame and desperation. It was a love that could not neigh it's name. It made filming the show a horror. 
(Alan Lubin, Mr Ed, The E True Hollywood Story)