The following is a pie chart explaining exactly what happens in the shower for most people. The two categories are "washing" and "winning fake arguments".
I think that the problem isn't when you have fake arguments in the shower but when you have REAL arguments with fake people ...
Also, where is sex on this chart. After all, everyone knows that happens like ... 50 times per day for me ... yeah. That, and I can kick a football to the moon!