Maybe grayowl wants to open one?
A good online resource for municipal by-laws of all sorts is here:
http://www.municom.com/Publications/41/bylaws_index.html
Look under body-rub parlours, or Adult Entertainment Parlours, or Massage parlours.
Doesn't look like there is any specific by-law for MPs in any of the three municipalities you mention, grayowl. However, minutes to one of London's council meetings mention a "Business Licensing by-law as it pertains to Adult Entertainment Services Parlours". So maybe there is something, just not available online.
Mississauga, Pickering and Kitchener all have specific by-laws relating to MPs, and it's useful to read them, as I believe other municipalities will look to these three for guidance.
A