I was wondering why someone in the middle of the night would want a massage? Then, at about 70% through the story, I realised that in Canada, a massage parlour

I was wondering why someone in the middle of the night would want a massage? Then, at about 70% through the story, I realised that in Canada, a massage parlour is not for getting massages but, basically, a whore-house. Why the misnomer?