OK, we'll go with years ago.....like 5 years.
I'm not sure if group showers in school was the norm when DDs attended. They never brought up the subject and I never asked. But I doubt it was the case any longer.
In junior high taking a shower was actually part of the grade for gym class. There was a teacher's aide watching to make sure we did. And those awful gym uniforms.

In high school they didn't care, and there usually wasn't time to take a shower anyway.
Yeah, I guess that's why sharing a room during business trips wasn't a big deal with my first stint with my company.