Erotic massage studios in the Swedish capital are a bit of a hit and miss. Supposedly one in five Asian salons offers "extra services". How do you know which ones? You don’t, but you’re more likely to find one outside of the city centre. Remember that you’re actively committing a crime when you’re paying for a hand job. You could try Stockholm Erotic Massage (http://www.stockholmeroticmassage.com/), they offer outcall experience in your hotel room, but again there is no guarantee. Massage in one of the Thai studios doesn’t cost all that much, you can get an hour of decent relaxation for €40.
There is one sure way of getting a sensual massage in Stockholm, including a happy ending: escort directories and classifieds sites. Check out the advertisements and profiles of the girls listed on these sites. You will certainly come across some ladies who offer erotisk massage, be it on incall or outcall basis. Some girls in nightclubs in Stockholm also offer massage on the side.