I've looked into this too and considered if it could work for my situations. However, there are very limited locales in the world (mainly just California) where it is a recognized and legal form of therapy. Unfortunately, being from Canada (like you) it is not an option, because it is viewed akin to prostitution. Even if you could find someone legally, I don't think you would find any sex therapist or PDoc that would agree to sex surrogacy as a viable treatment method.

If you did find a viable therapist that uses this method...I would be interesting in knowing where they are.