Did anyone one use a urinal to potty train? I have read that it can cause issues with getting them to poop on the potty. Our twins are almost 2. they don't tell us they have to go yet. our son loves to stand up and pee in the bathtub and even outside the tub even though the toddler potty umis right their. he has no interest in sitting on it long enough to pee. He would rather run around naked.