Before I respond to your compliant advertising comments, please allow me to digress about a subtle issue with respect to the commission of an offence, and immunity for it.
While it is true that only third parties can be prosecuted for an advertising offence under Section 286.4 and that SPs selling their own sexual services are immune from prosecution of that offence, this doesn't mean that prostitutes are not committing that offence.
There's
no exception in the statute for prostitutes
UNDER THE OFFENCE PROVISIONS for communicating and advertising (sections 286.4 and 286.2, respectively). Go see for yourself. Tell me where in either of these sections, you see an exemption for prostitutes.
http://www.parl.gc.ca/HousePublications/Publication.aspx?Pub=Bill&Doc=C-36&File=4
There's only a specific immunity provision for advertising and communication (as well as aiding & abetting) by escorts who sell their own services.
It is a SEPARATE provision. It is not an exception for the offence. If there was an exception to the offence, worded like this "Everyone, except for individuals who sell their own sexual services, who commits an offence ...", then you would technically be correct in what you're saying.
Therefore, prostitutes are committing an offence if they advertise (or materially benefit) BUT FOR WHICH THEY CAN'T BE PROSECUTED according to the specific immunity provision that follows.
If I were an escort, I would be concerned about this distinction, since I'd be worried if the police can harass me with a charge that might stay on my record, regardless of the certainty of no conviction.
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Now getting back to your point about whether an advertisement is compliant, that remains a question of fact I suppose, but it wouldn't hurt to apply some due diligence and prevent being low-hanging fruit to the LE. Why make it easy for them?
You say it would be moot,
but that's with respect to any conviction.
However, IF the possibility exists for being arrested and charged with the offence, albeit immunity, I'd rather not advertise a BJ and risk getting a charge on my record that doesn't stick. Unless there's a legal precedent that would strike out such charges and purge the record due to immunity or some other reason (i.e., selling is still legal so per MPA2's understanding of the government's hearings on this bill, immunity may be implied, etc. etc.), I would not be specific about services if they are sexual to avoid any LE heat.
The other reason why an SP may want to modify her advertising, is to protect YOU, the client. Since johns have legal exposure merely for communicating for the purposes of obtaining sexual services for consideration, why would a smart SP increase that risk for her customers (Jessica aptly pointed this out to me. She and MFF have taken measures to reduce that risk for their customers.) You can't argue that you were paying for companionship if she expressly advertises a sexual menu.