Those are customs that Canadians have developed. We don't need a law for everything we do. The custom where Canadians feel comfortable having male washrooms and female washrooms, and that people don't go in the other washroom.... It is a Canadian custom.
Mind you, people would like to change that, but Canadians have established this custom and they feel comfortable with that. In the case of B.J.'s Lounge, they felt very uncomfortable with a man walking in thinking he was a woman.