How did you react? ( Guys please!)?!

When i was about 9 I went to summer camp. There were two boys who were 16 that everyone looked up to. One day went to the local pool and we camp back to camp to shower. I immediatly got under the shower with my trunks, as the other boys my age did, but the two 16 year olds stripped naked and showered. This was the first time any of us had seen another boy naked. They even walked out of the shower area naked and went the their cabins. None of us knew how to react to this sight. ( the next time we went to the pool everyone got naked thought to be like the big kids I guess). I was wondering how did you react at your first sight of another boy naked?