When I was in HS ...a hunnerd years ago....we had PE three times a week, and swimming once a week.
We had a bay shower, and showering after was mandatory, except for one week a month.
We had to walk, naked, from our locker to the shower...and it was a very large locker room. The teacher stood at the shower entry and checked off each girl's name as she came out, and grabbed a towel....after showering.
On swim days, we had to walk naked from our lockers to where we grabbed suits, then after class, take off the suit, then go to the shower, again to be checked off a list after.
I have no clue if any of the girls in my class were lesbian or not....it doesn't matter...it's was still a humiliating experience. I can only imagine it would have been even worse, if I had known there were girls that were lesbians in there too.