A newlywed young woman, after witnessing a crossing of horses in a stud farm, decides to play a little joke with her husband and demands that he position himself as a horse and she as a mare every time they have a sexual relationship.

On a farm, a woman witnesses a horse crossing. The naturalness and savagery of the act makes her extremely excited, becoming interested in horses. He uses books and begins to study equine behavior. This makes the husband jealous, who is relegated to the background. Every time her husband wants to have sex, she demands that he position himself as a horse. He gives in. She is positional like a mare. All of this in a tone of farce, as a joke. She can only get excited in that crazy way. Gradually, the game takes another direction. Now, the woman forces her husband to behave like a horse. When he refuses, she goes into hysterics. The husband again undergoes humiliation. She starts to give you hay and alfalfa to eat. He eats and ends up, inexplicably, enjoying and accepting his new equine condition of living. She buys a saddle and rides him, treating him like a horse.