While I don't have any hard, fast numbers...I'm thinking there has to be at least 100 reasons why humans should not have sex with animals.

Add one more to the list...

Cancer.

In a study done by a team of Brazilian urologists, 35% of the men interviewed reported having sex with an animal at some point in their lives.  Obviously all of those hot Brazilian chicks running around topless on the beaches in Rio are not having sex with Brazilian men.  These men (the 35%) were  also found to be twice as likely to develop cancer of the penis, and had a much higher incidence of sexually transmitted diseases.

Something to keep in mind the next time that goat at the petting zoo bats her eyes at you.

Thankfully for our man Puff, the land whale at the corner of the bar isn't actually a member of the animal kingdom...