I don't know how to respond to that. Some truths are just self-evident. You do what you want in your shower, and I'll do what I want in mine.
It was self evident to me until I analized the concept with an adult mind. "Civilized people don't do that" is not a reason for not doing a thing. It begs the question, "why not." If there is no answer, then my paradigm shifts and I do the thing, if consequences of doing it enhance my life.
So far they have. 8^>
Funny thing is, when I confessed it to my wife a year ago she said "I know you do." I asked how she knew and she said she can tell by the sound in the shower when I am. Her attitude is "why wouldn't you?" And she means women too!
That sounds a lot like, "it's just how I've been conditioned, but I've never actually stopped to wonder if it made sense."
Caesar: "Pardon him Theodotus: he is a barbarian, and thinks that the customs of his tribe and island are the laws of nature."
-- Caesar and Cleopatra, Act II, George Bernard Shaw"That which is unchallenged and exercised as habit rapidly becomes ritual. When this occurs, dissent becomes an object of surprise, if not resentment."
-- B. Carmon Hardy