Privacy--What's that?

I was folding laundry in my bedroom this morning with my kids when I had to use the potty. The lock to my bathroom is broken, but I thought I could be in and out of the baño without interruption...I was wrong. Both of my stay-home girls were in the bathroom with me moments after I had closed the door. I am not sure what causes this phenomenon. However, I learned my lesson and used a different bathroom a moment ago (one with a lock) only to find both of the girls standing next to each other right outside the door when I opened it.
My question is--what do they think I am doing in there that needs an audience? (because I'm pretty sure I don't)
Rachel is now screaming at my side because I came here to type my thoughts rather than picking her up when I was finished, so I'd better end my post, but for anyone who gets to use the potty in privacy, may I say, enjoy it!