While I don’t at all disagree that nobody in the women’s changing room should have to put up with a man wandering in, I’m going to try one last time because my previous posts have been pretty much ignored, probably thanks to the ridiculous derailing going on.
Paedophiles don’t limit their interest to pubescent young people. Some are specifically interested in pre-pubescent children. And they don’t limit their interest to the opposite sex. There are homosexual paedophiles, at the risk of stating the obvious. Good grief, gay men fought for decades not to be viewed as a threat to children just by virtue of their sexuality, which had been a strong prejudice previously.
When men take their kids into the men’s, they are exposed to unrelated adult men. When pubescent and teenage boys get changed in the men’s, they are exposed to unrelated adult men, and they have no parent there to protect them in the same way that the notional teenage girl mentioned by you and other posters hasn’t in the women’s.
I find it completely baffling that a poster would on the one hand be concerned about a teenage girl in the women’s if a man goes in (quite rightly), but then say that any children in the men’s would be young enough for it not to be a problem. Er, except the 8+ year old boys in there, the counterparts of the girls you’ve just mentioned.
There absolutely has to be family cubicles, and lots of them, in swimming pools, or imo they are failing in their safeguarding duties. Open communal changing rooms are abhorrent for everyone but especially children, of both sexes. Yes, in the OP, the man is going to have to take his kid into the men’s if there’s nowhere else because the starting point has to be he can’t be in the women’s, but when you think about it, especially in the context of a children’s swimming lesson, it solves very little.