If there are insufficient restroom facilities for each sex to have its own, what happens? Uh...they share. And when sufficient facilities are available, they do not. Is this difficult?
While I do take a certain dark satisfaction in a male barging in where he's not wanted since it's been so often by feminists, it isn't really a very good common-sense solution. My guess is that there are sufficient facilities elsewhere in a town the size of Petaluma.
aka loser males who can't find dates.