How a man avoid the second time to arrive

A man and his wife never fought for 25 years of their marriage.
A friend asked him how he had managed to make it possible.

He narrated:

"We went for our Honeymoon in Australia 25 years ago and while riding on a horse, My wife's horse jumped and my wife fell down.
She got up,patted the horse's back and said "This is your first time"

After a while it happened again. She patted the horse again and said: "This is your second time"

The horse did it again the 3rd time,
She brought out a gun and shot the horse dead

I Was so shocked and I shouted at her. . . . . . . ."Are you crazy! What's wrong with you?
Why did you kill the horse?

She smiled at me and said
"This is your first time"

Since then. . . . . . . . . . . . . . . .
My Mouth ....................................