Some Scouting groups have been mixed sex since forever - I was a female Baden Powell Scout in the 80s.
We were (& they still are) a mixed sex breakaway group that goes in for traditional scouting - lots of bivvying & whittling!
The main 'official' group, Scouting Association, was single sex until they admitted girls in the early 90s because of declining numbers of male volunteers. Basically, they needed women to run the activities, & if those women couldn't bring their dds, they weren't volunteering in sufficient numbers, which is fair enough.
Absolutely nothing stopping anyone from setting up an all male version.
Meanwhile, my BP Scouts troop was safeguarded very effectively when I was involved.
Ok, you had a good chance of slicing your thumb off or getting lost orienteering, because the USP was basically that we were lairy adventurous pioneer types (not like Scouting Association: bunch of Walter the Softy types as far as we were concerned 😉).
But girls' & boys' sleeping/washing arrangements were strictly segregated - if we half dozen girls couldn't persuade our long suffering female leader (there was only one & she was the dw of the main leader) to come camping...we weren't allowed to go.
Poor women spent many a night in a ditch in a binbag with us when I'm quite sure she'd rather have been watching Bergerac with a big glass of Mateus Rose tbh.
From everything I hear, now SA are mixed, they risk assess mixed camping very carefully.
As a teacher who's been running mixed residentials for 20 years, I risk assess sleeping arrangements etc carefully.
Girl Guides don't. That's the problem. Their own policies actively prevent them from risk assessing mixed groups on residentials because said policies make it impossible for them to recognise that they ARE running mixed sex activities in the first place. THAT is the safeguarding issue, not the inclusion of (some) males.
Obviously there are additionally other issues around inclusion for girls who are effectively excluded as it's now a mixed sex space...