From the article...
When police interviewed Romero, he allegedly told them he had used his fingers to clean the animal’s genitals and generally becomes aroused seeing animals in heat. The sexual contact, he allegedly told police, was an accident.
But police said he also admitted to masturbating with the animal five or six times and called Florida “backwards” because people frown on zoophilia.
Does he sniff his fingers after these encounters? Does a donkey emit a "fishy" odor?