I think, not sure, that Miller is female. We rarely agree, but do once in a while. This is not one of the times.
Meantime, as years have passed, I or we have tended to go to less major rock concerts and all that. Chain restaurants will tend to have the Ladies or Mens signs, now morphing over time, women/men, to symbols. Some of my favorite cafes, at least a few grocery stores, have one fairly big bathroom for one person at a time, labeled as Restroom. Which is simple and covers all of us.
Which reminds me, I should dig out a photo I took when a group of us girlfriends went to Las Vegas for one of the friend's birthdays. We stopped at a Highway Rest Stop (15?). Ladies (I think that was the word) had a second rather large sign, NO DOGS ALLOWED. A multiple meaning wordage.