Its certainly true. A while back I had a conversation with my teenage godson after he refused to change with me and his dad in a public changing room. He wanted to drive home withot showereing and simply putting clothes on top of his still wet suit.
His dad didn't want him soaking his car and an argument of sorts took place. After the fact I asked him what he did after p.e at school. He said he didn't showelr. When I was at school we were all expected to shower. A teacher would watch us go through the showers to make sure we didn't just walk past. We were all naked and nobody cared(and nobody thought the teachers were perverts or anything, it was just basic hygiene.
But to my godson the idea of stewing in his own filth for a day was better than appearing nude in front of other boys.. needless to say I have always been careful not to geto close to him on a school day since.