-It has to do with _probabilistic predictions about_ psychology in a world where [male violence against females is _older than humanity itself_](https://en.wikipedia.org/w/index.php?title=Sexual_coercion&oldid=866576906). We could imagine an alternate universe designed by a loving God, where the people have the same physical forms as the women and men of our own world, but where rape and sexual harrassment and voyeurism are unknown, and in _that_ world, people with female bodies would have no particular reason to be wary of people with male bodies.[ref]Well, except for that _d_≈2.6 difference in muscle mass should a dispute escalate to physical fighting.[/ref]
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-Certainly _most_ men are nice, civilized people who don't harrass women—and occasional Hemsworthlike, lumberjack-bearded androphilic trans men with a feminine personalities, present even _less_ of a threat. But when designing the social norms for a safe space for the modal cis woman, false positives (including someone who shouldn't be included) are probably going to be worse than false negatives (excluding someone who shouldn't be). If "Does this person look male?" is _easier to assess_ than "Does this person-of-whatever-sex look like a potential threat to my safety, comfort, and privacy?"—and possibly more importantly, is easier for third parties to _agree on_ when third parties are called in to enforce the rules—then the rule ends up being "no men" (or "no male-looking people").
+It has to do with _probabilistic predictions about_ psychology in a world where [male violence against females is _older than humanity itself_](https://en.wikipedia.org/w/index.php?title=Sexual_coercion&oldid=866576906), and with [defensible Schelling points](https://www.lesswrong.com/posts/Kbm6QnJv9dgWsPHQP/schelling-fences-on-slippery-slopes).