After a man died from injuries he sustained from having sex with a horse, King County sheriff's detectives are investigating other activities on the farm in question:

But because investigators found chickens, goats and sheep on the property, they are looking into whether animal cruelty — which is a crime — was committed by having sex with these smaller, weaker animals, he said.

The farm was talked about in Internet chat rooms as a destination for people looking to have sex with livestock, he said.

"A significant number of people, we believe, have likely visited this farm," said Urquhart.

The man having sex with the horse wasn't illegal, especially since it didn't get injured, he did.  (I wonder if there are any mules on that farm, what, with all the asses having sex with horses and all...) 

Damn, some people are just plain gross.