[Mariner]

Just scream loudly: There’s a man in the ladies room!

That will take care of 90% of such intrusions.

[NorseWood]

Always carry a can of bear spray.

[hanamizu]

Just scream loudly: There’s a man in the ladies room!

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I’ve only heard a woman’s true scream once in my life. We were camping at a park at Big Sur and a man went into the women’s bathroom. It sent chills down my spine. Most women can’t or won’t do it, but when and if they do, it will draw attention.