Animal Lovers: Zoophiles Make Scientists Rethink Human Sexuality
scientificamerican.com
scientificamerican.com
Edit: My bad, as a reply points out, he speaks of having sex with a woman not making him a heterosexual (and the second reference to the female chimp just said “wrong sex”).
(http://www.qub.ac.uk/schools/SchoolofHistoryandAnthropology/...)
These are the words of a gay man.
"Guns, Germs and Steel", Jared Diamond.
EDIT: horizontal disease and horizontal gene transfer are very powerful forces in evolution. The distribution of human populations on Earth today owe a lot to such crowd diseases (whatever the means by which they got into humans from animals; inhalation of sprayed out rhinoviruses or eating raw meat has been proven sufficient in cases.)