Why are all you people doing Google searches on "sex with animals"?

The single biggest source of traffic to this site on days when more exalted company don't link here is Google searches on "sex with animals." Just for the record, my post welcoming Skippy the Bush Kangaroo to the blogroll under the heading "We don't have sex with animals, we just blogroll them" comes up 9th in the search results.

But seriously....why on earth are you people looking for sites on sex with animals? Is this practice more prevalent than I want to think about?