When I was younger, my mom would always remind me and my brothers to pull back the skin to clean, and eventually it fully "ripped" - as you put it. I don't remember when I first learned a guy's penis could be circumcised. Probably at my Catholic school when I learned about the Jews having to be circumcised.
Oh well, I'm glad I'm uncut. I found out from my girl friends tonight that they hate when a guy's uncut, which I totally disagree with.
If I ever have children, I would probably do what my mom did. They should clean it, after all.