Very good point. The whole point of training something is to have some sort of control over it. (As a slave, I know this, firsthand. LOL) If you are training something, like a dog, to do ANYTHING, that dog is most likely going to need triggers to react to. And, you aren't going to trigger him (if you are a wise Master/Mistress) with average, usual, normal or everyday things. Just as you wouldn't use "no" as a safeword. It would simply not be very good training to do so. However, again, speaking from some experience, I will say that even with training, it is very difficult to train a cock. LOL Anyone with male slaves would probably know what I am talking about. And, that, in itself, may present a problem. But, I am sure there are ways around it via a good Master/Mistress/Trainer. Not only that, animals have a very good sense of scent and not all human scents attract animals. Animals, oddly enough, instinctually seem to know if a female is going to be receptive or not.Now, if I am wrong, please correct me, but like with any other training, the pleasure animal would be conditioned to perform under certain circumstances. Most owners, even if they enjoy sexual performances, do not want dog to do it any-time-any-where. In training you would use certain triggers (like socks on his paws, one room only, naked person on all fours) stuff that I normal life will not happen. Last thing you want is for your dog to try to jump you on the walk in the park.