Prostitution is not regulated in Canada, so there are no set rules SPs must follow regarding testing. But if they are diligent and consummate pros who are concerned about their safety as well as their clients, it should be twice a month. The popular place is Hassle Free in DT where it's very private and free.
When it comes to DFK, BBBJ, as long as there's fluid exchange/contact, there will always be a risk, but perhaps minimal compared to full service and nothing that penicillin can't cure.