I'm circumcised, as are most men my age. IIRC, I didn't even know what the word meant until I was an adult. I had thought all guys were born this way. Thinking back though, I remember goofing around with some friends at the local stadium during off hours and one of my (uncircumcised) friends pulled his pants down to pee on the field and....WTF was I seeeing? I was sorta dumbfounded. I couldn't make sense of it (I concluded he was deformed and moved on). Even later in gym class locker room, everyone was circumcised.