Okay, so we appear to have missed the framing of my post about "codes of conduct".
I asked the question why we don't currently have these around anymore, as I'm sure they used to exist in swimming pools, for example, when I was younger.
The purpose was not to codify anything, those notices used to be up as a disclaimer essentially, so that the management of the facility had essentially warned users that they are at the discretion of the management's interpretation of the word "reasonable modesty".
It's not a solution, it's not a catch-all, I was simply wondering why they weren't there. It strikes me that if someone - anyone - is gawping at me in a changing room, or exposing their genital gratuitously, the management might want a little disclaimer in place to eject that person at their own discretion.
And as for standing in my knickers washing blood out of my trousers, someone might think that was unreasonably immodest, but the management would surely say "nope, our decision is final, we reckon that's quite reasonable actually".
It was not presented as a "don't worry, mixed sex is fine if you just have signs!", not at all. It was, "I wonder why we don't have signs anymore, because no-one wants to see lewd behaviour from anyone in a toilet or changing room, do they".
Again, I really do think the appropriate language and framing was all there in my original post.