"The Municipal Act and Vancouver Charter allow 
municipalities to effectively prohibit the sale of sex toys 
in their jurisdiction. Typically a municipality uses this 
power to define the sale of sex toys as 'adult entertainment' 
and then to confine that business to a zone where there is no 
land available for rent or purchase - a de facto prohibition. 
The result is that pre-existing sex stores, which are almost 
always seedy and intimidating and purveying mainly mass 
market pornography, have a monopoly on the sale of sex toys. 
BC law effectively prevents the establishment of wholesome, 
woman-friendly, sex-positive businesses that sell sex toys. 
By protecting only seedy style sex stores, BC law helps 
stigmatize the erotic products industry." -- from the
[BC]
Sex Party platform
(Note that this is, as far as I can tell, actually a 
pretty widespread tactic in the US as well as CA, so you
can substitute plenty of other places for the geographical
references in this passage (after looking up the name of 
the local zoning law, of course).)