On the other hand, folks, if people really want to abuse the ability to walk into a room, (not exactly a Herculean task) then they will. Period. Hell, people walk into opposite sex restrooms all the time by accident, (I'd hope, anyway--I sure didn't mean to) it's not hard.
The most commonly spouted rationale for why this law is "needed" (that I've heard) is to prevent sexual assaults, and I just find that concept laughable. So a rapist who has limited or no qualms whatsoever about physically abusing another person is going to be stonewalled by a law about not being allowed to walk into a room? Or, you know, slink in when no one is looking? That sounds awfully silly to me. Someone who commits a crime is a criminal, regardless of anything else. And violent criminals, by the very state of being violemt criminals, don't exactly have a high respect for paper laws.
In the military, you have to crap in the right ditch so the entire unit doesn't get infected with your filth, same with prehistoric societies. But aside from that, we've had this pooping thing down pretty well for quite a few centuries, if not millennia. Now politicians are trying to make possibly the simplest task of any life form complex. Don't we have more pressing matters to attend to? Like making our children better at reading and math?