Yes, I think we all pee in the shower sometimes. Wait a minute, nobody mentioned anything about peeing in the shower. Never mind.
When I had sciatica and a herniated disk last year, I'd pee in the shower. It was too much agony to sit and use the toilet. I'd get in, turn on the water, pee, then take a shower..lol.. However, I DID use the toilet to go poo.