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We had no windows, but teachers did wander in and out of our locker-rooms. I don't think they'd ever look into the showers though; that is pretty weird. Sometimes the coaches would wander in to the shower room to yell at us to hurry up, but the showers themselves all had curtains so it wasn't an issue.

We didn't have curtains.  It was just like in the military, shower heads out of a bare wall with a tile floor, no partitions.  The coach could come in at his discretion.  There was no male teacher at that school whose sɛҳuąƖity would have been questioned --- there was one priest who got whispered about, 99% sure he was gαy, but he wasn't involved with athletics.  Probably just as well.

Why don’t the kids just go home to shower?
I am so grateful my kids are homeschooled.  And even if they did go to a public or private school, they wouldn’t be in sports if they were required to shower in open areas and expose themselves to some sick pedos employed by the school.
It is just too common nowadays for creeps to be working at schools. They target these places for a reason.
We recently had a news report here about a cheer-school in our State where they found a hidden camera in one of the girls bathrooms. The man charged with filming that bathroom for over 4 months was an employee for the school.
I can’t imagine my daughter being one of the many victims on that camera footage.

In the present social climate, it may end up coming to that, or at least divided stalls with absolute privacy.  Traditionally, pupils engaged in sports or physical education have been expected to shower after their activities are done.  It's not been seen as a good thing, to go around sweaty and smelly all day, which could very well happen, if PE was at the beginning of the day.  Also, in years past, schools were generally not air-conditioned, and it could get pretty steamy on hot days.  In my Catholic high school, late 1970s, we had huge fans at the end of the hall, and that was it.  It got hot, they opened the windows.  This was just typical of American society in general.  Given this, going around having sweated profusely in gym class would not have been good.  If anyone was gαy, it would have been so far on the "down low" that it would have been cloaked in silence, and nobody would ever know. 

(But there were exceptions.  In my Catholic high school, there was an openly gαy male student, and nobody treated it as an issue, it was common knowledge that he associated with older men and went to gαy nightclubs.  He was later arrested for violating a minor.  I don't know how he handled the shower situation.  Our parish was so eaten up with Vatican II and "all things made new" that nobody could see straight --- no pun intended --- and a charismatic young priest who taught his religion students that dissent from Humanae vitae was legitimate, later ended up on charges of stalking and molesting one of his female students.  He no longer functions as a priest.)

Unfortunately, now that everyone has a camera on their phone, it could put many kids in danger of having photos taken of them in locker rooms, and then put up online by creeps. Creeps that are students at the schools or employees that work there. 
I am certain kids shouldn’t be in those locker rooms at all if parents don’t want their children’s purity put on the line just so they can play sports.