When I was younger all us neighbor kids used to live at either our house or Mike's. It seemed like our childhood was one big sleepover. There could be five or six of us on a given night. Whenever we went to Mike's house his parents made sure we had baths and were in bed at a early time(I think around 9:00 PM).
It was not unusual for them to be sending all of us to bathe together. They didn't peek in on us, but they made sure we did have a bath. This started when we were four or five years old and continued until we started to develop.
I remember starting to get pubic hair and breasts while Cindy and Tom were quite undeveloped. It never turned into anything sexual, but I did see a fair number of erections by the time I was 12. I kinda liked it. It made me want to tease the guys. I would sit on the edge of the tub and make sure my pussy was open for all to see and then see which guy got an erection first. No one ever commented on it-it was just seemed natural.
Of course, by the time I was 11 or 12 I knew what erections were and why boys got them and usually I would masturbate as soon as everyone left in the morning. I suspect the guys liked it too. Too bad we all have get older and develop weird hang ups!