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Same goes for virtually any space that used to be male-only. It's become socially unacceptable (and often illegal) to exclude females from anything, while it's still perfectly OK to exclude males.

What’s an example of a male-excluding space you’ve seen that couldn’t have a female-excluding counterpart?

1. Women-only workout areas in gyms - quite common, never seen one for men

2. All-female colleges (many), there is perhaps one or two all-male, if they even still exist

Just google something like "women business network".

Also the "WIN" network.

Boy Scouts

That's mostly it being a victim of its own success; here in Canada, Scouts long held a better reputation than Guides. Something fundamentally different about how the organizations and parental leadership approached the kids, I suspect.

Scouts are not integrated. Troops are separated by sex. They are safe in their spaces.