Things can get steamy when it comes the erotic massage scene in Porto. It might not be huge but the quality is very respectable. Studios like the Diva Spa (http://www.divaspa.pt/) at Rua Simão Bolívar and Glamour Spa (http://www.spa-porto.pt/) at Av. da Boavista flaunt their gorgeous girls on their websites.
There’s only a handful of studios, but you can check escort agencies or classifieds for more options. Expect to pay at least €100 for an hour of erotic massage in Porto.