7th grade (first year of junior high in the olden days), gym, jocks and showering were the law. I thought those boys showering in their jocks or tightie whighties were absolutely weird. I felt totally comfortable and never had any issues being nude with other guys because of the way I was raised. My Dad had prepared me for it and casual nudity at home was the norm. Hell, me and my bro's spent a lot of time naked swimming, showering and being "guys" our whole lives. Saw my Dad's meat often and being nude around other males was no big deal for me. Still isn't.