According to Billy Goldberg, MD — co-author of Let's Play Doctor and a self-professed shower pee-er —urine is sterile, non-toxic, and can even help clear up a case of athlete's foot. As for whether or not urine will damage the pipes below your shower drain, well, you have nothing to worry
Is it OK to Pee in the Shower? - Apartment Therapy
While it may sound disgusting, peeing in the shower can actually keep it clean. Fungus is the worst and itcan easily grow in the shower. If you pee while you arein the shower, it can kill any fungus that is growing. Urine contains both uric acid and ammonia which cankeep a fungus problem from becoming
What Happens When You Urinate In The Shower - Facts Verse
Everyone should be peeing in their showers!