QUOTE(LamontStormstar @ Tue 1st January 2008, 1:33pm)
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As for animals consenting, it's hard to tell if the animal is just going along with it like when it goes along with things it doesn't like such as taking a bath. The only time you know the animal consents is if the male animal dryhumps a human (dogs do that) or rapes a human (very rare).
Dogs of both sexes "dry hump". Our young bitch does it occasionally to other dogs and very occasionally, people. It is not sexual activity, it is establishing dominance. It is an instinctive, not a considered, action.
Dogs are very trainable and will do most things for a biscuit, including things that they do not much want to do. People generally establish a very dominant relationship over their dogs, so it is not surprising that a dog would tolerate fairly unpleasant behaviour.
We have a guide dog puppy and so are very into training. We were quite surprised how easy it was to get it to urinate on command, and to a lesser degree of success so far, to defecate on command. It is therefore entirely unsurprising that you can get dogs to perform other bodily functions on command.