This gets asked every now and then and the answer is always no, there are no known registered massage therapists who do extras. If there are any out there it is an EXTREMELY well kept secret between parties and you certainly aren't going to find them advertising or being recommended on an internet forum. Any RMT found exchanging sexual services for money or in a "professional" context faces having their license permanently revoked.
Personally, I'd give my left ball to find one, but there appears to be very little crossover between licensed massage therapy & sexual services.