At my house "potty time" is a learning experience all the way around!!! The "little ones" learn how to go potty, the "big ones" get to teach the little ones and encourage them, and they ALL "learn about GENDER!" "Why doesn't she have a pee-pee?" "what is that?" every once in a while they will also walk in on me (no, who am I kidding!) very often...they walk in on me, I have been asked what parts I have as well. I am a VERY open person, my own kids call the parts by their proper names (no pee pee or wee wee). Takes the "oh my!" out of things. It's all matter of fact in my house. The kids ask I answer and the "oh Wow!" is over.
Too many kids to do one at a time in the potty, they all stand in line and wait their turn at the toilet and sink. (unless they request privacy, then we respect them and give it)