The way it was explained to me is that it is illegal to discuss services anywhere that could be construed as a public place. Even cell phone bookings are technically illegal. I'm going to double-check to be sure, but I got the info from Maggie's, a support service run by sex workers for sex workers here in Toronto, so it should be accurate.
Thanks for the advice, I'll be sure to get my site up and running ASAP!
Cece