If the goal is to just have a LMT handle your willy, there's actually a legit way to do it. You just have to find out if they offer Massage Therapy for ED. Some places will, some won't. You still have to scout the place out. 1) To make sure you're not going to get a guy, and if the female LMT is your type. 2) It's the shaft kind, not the Prostate kind. Unless that's fine with you. 3) Try and maintain the cover story. Don't wake up too quick, as that will let them know you don't have ED. 4) Finally, no guarantee for a Happy Ending.
If you really want to have an AMP session with a LMT, the best way is to ask them out, and do it on their personal time. Like
@littledee said, most won't risk their LMT License on something illegal.