Oh dear.
I remember reading a book where one of the characters was convicted of stealing a sheep with intention to bugger it - he said it felt about the same as having sex with a woman except without the emotional involvement, so therefore whenever he felt the urge, he preferred to do it with a sheep.
Which reminds me of listening to this radio show a few years back and the presenters asked people to ring up and answer the question 'If you had to have intercourse with an animal, which one would you choose?' Disturbingly, most people chose a dog. For me, I'd choose something like an ant (I assume their definition of 'animal' would include insects et. al., they didn't strike me as biology aficionadoes) so I could 'accidentally' squash it beforehand and thus be unable to carry out carnal relations with it.