"The biggest threat to American women is physical sexual assault and bodily harm from their spouses and boyfriends."
"Going to H2O Oasis and having a man dress as a woman to sexually assault women ranks about a 0% of happening since their are laws on the books for decades that prevent sexual assaults in public any facilities."
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It's against the law to physically/sexually assault your wife/girlfriend.
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Sexual assaults in bathrooms/locker rooms are rare but it happens. 
https://www.adn.com/alaska-news/article/man-charged-attempted-child-molestation-movie/2012/09/11/
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While there are many contributing factors to why that number is low, I suspect one of the reasons is typically if a man walks into a girls bathroom it will draw suspicion. Or maybe at least, most would-be assailants think it would draw suspicion. There's a real risk here how much of one is incalculable, could be minimal or could be catastrophic. To deny it completely however is just asinine.