Totally agree @thing47 , it’s so clear how much variation there is depending on where you live.
I went to an inner city co-ed state school and my first experience of sexual harassment was by grown men on public transport, and not at school in the slightest.
Some replies feel slightly scare mongering - we clearly had separate toilets and changing rooms for PE and had the option to do mixed or separate PE lessons (which maybe was unique).
Where I grew up the private same sex schools were full of eating disorders, class A drugs, and had a reputation of being easy shags for the local boys schools. That could obviously be confounded by the addition privilege/entitlement of being private).
I’ve got 3 STEM degrees and work in a heavily male dominated sector and although co-ed isn’t for everyone, I did learn very early on in my education how to get my voice heard over men and I also think it made me incredibly competitive as I refused to be let boys beat me in the sciences/maths, which has served me well. Personally I think I would have really struggled in a girls only environment, and I think any head strong nature would have been worn down by trying to fit in.
Obviously most of us went through school without social media as it is today, but I’d be delighted if a daughter of mine had the school experience I did.