In fact, that would be the greatest harm done to the boy!
How do showers destroy a moral compass? You beg the question with great vigor.
Here, why don’t you go look at an actual organization that is involved with treatment of homosexuals: http://www.narth.com
They chronicle many evils committed by adults by which children can be pulled into the lifestyle, but same sex showering by its lonesome does not appear to be among them.
You beg the question so much, void of facts or empirical study, you might as well put on a beggar’s cloak.