Usually it's morning when I take a shower, and I need to pee after waking up. Because I don't want to use the toilet and then either not flush until I'm done showering, or waiting 15 minutes to make sure the water isn't going to be a combination of freezing cold and scalding hot in alternating cycles, I just pee in the shower out of convenience. Apparently my mom pees in the shower because she can't hold it in with the sound of running water, but knowing that fact has never bothered me. It's all running down the drain anyway, and there are much worse things in this world to freak out about.