Its a redundant argument, because if I say that only if yiyre okay with men using your toilet someone will be along to say but they never have queues.
You can't have it all the ways though. If you genuinely believe men shouldn't be in women's spaces, due to the dangers, them you can't then claim needing the toilet overrides that
The answer is no. Nobody should be in the opposite sex toilet. If it's a theatre etc , leave a second before the interval, go before it starts. I dont believe that hundreds of women MUST go to the toilet while out at a certain time. If it's a need, then unless you have a conveniently timed bladder, you would need it during the show.
I don't see any reason ever why someone should use men's toilets , even if they're empty - someone can still go in. Unless they're absolutely desperate, and want to chance it, but that isn't what's being described in this thread.
People are even blaming men now for lack of toilet space. Take it up with the facilities!