For the same reason picking your nose is disgusting.
B. has never been a problem for me, and even if it was I still assert that it would be harmlessly washed away down the drain.
Eventually. Tell you what. Get a bottle of food color. Get under the shower. Pour the food color out. Watch how long it takes before all the color disappears.
C. I have no idea what you're talking about.
Oh you will though. You will.
Yes, but as a man I can fairly easily aim my urine where I want to, like into the drain.
Oh you will though. You will. incontinence
I know that incontinence is, but I fail to see how taking a leak in the shower has anything to do with it.