So you agree that their penis must have been on display?
On the loo? Why would I see anyone on the loo, male or female?
Shower? Were the showers in full view of everyone? It would have been mentioned if they were naked.
Naked from the waist down before or after a shower? So also fully naked at some point? Well that wasn't mentioned, so unlikely to be the scenario here.
To determine whether someone was naked from the waist down you would have to see the pants area, so also see the genitals. Yes?