This holds zero relevance to the issue of distraction.Well, according to science, sexual activity correlates to an increase in performance
The distraction carries on during normal, daily activities.Ok, so lets suppose that while actually in the process of taking a shower someone gets a bit distracted. Are you afraid they might forget to wash behind their ears? Oh noes!
Once the shower is over, presumably soldiers should have enough mental discipline to focus on the task at hand.
Anyway, this is the military's policy, and apparently the military desires a minimum of distractions from the accomplishment of one's job.
If you are feeling aroused by that(hah), feel free to complain to your local town officer, beyond that there's not much that I could do.