Whether licking food off Haskell's face, licking his own private parts, or marking his territory by urinating on Haskell's front door, Schneider's beast-like behavior is mildly amusing, largely because he seems almost embarrassed to be doing it. If the film sounds ridiculous, it is because it is founded on a ridiculous theory. One certainly doesn't begin to have sexual longings for creatures outside of one's own species. God designed the animal kingdom to fall within clearly defined and separate categories. God saw that it was good.
All evolution can only take place within the parameters of each species.