My oldest has attended private schools from K through college graduation.
Lots of overnight school trips , many in rustic sleeping arrangements ( tents- in downpours) & sleepovers usually co-ed sleeping arrangements including parent chaperones. ( not to say that one dad of one family- sleeps with mom of another family, although that is what one boy offered when my D wanted me to stay overnight on a trip and I wasn't prepared to stay)
Not a problem, they are family style.
We don't sit around naked, we shut the door when we use the bathroom, and we are dressed when in shared areas. How is this so difficult?