I'm an amateur adult who is currently leasing and competing on a stallion. Generally speaking, no one ever knows he is a stallion because he is so well mannered. His only "stud behavior" is that he will yell to the girls now and again and poop to make his presence known. Other than that, he's not an idiot and knows what his job is at a show, or anywhere else for that manner. Im 100% certain that other stallions aren't like him, just like some mares can be more moody than others. But I personally feel if you are buying a horse that is a good stallion, it can be a return on investment to have breeding abilities.