I would not expect nor ask for this at a legitimate massage facility as i don't see any therapeutic benefit and only a sexual benefit. I would certainly expect this in a rub and tug parlor.
The very first time I went for a massage - just a few months ago - the Chinese masseuse gave me a very long and pleasant genital massage that included her paying attention to my testicles, groin, perineum and the region around my anus - around, not the opening.
I was very pleasantly surprised as I had been reading how big a no-no deal this was supposed to be with massages and all. I've gone back to the same place and a second massage salon and both places did more or less the same - expecting a nice tip of course which was given with gratitude. In fact, in a second establishment, there were signs of an erect penis crossed out in red, like a traffic sign - no sexual acts. It was respected, but very literally, as the masseuse did indeed not massage or touch my penis. Instead she massaged all around it, including testicles/scrotum, thereby respecting the strict letter of the rules, but certainly not the spirit ... ha ha.
So for me, it is apparently not that difficult to have done with a massage.
Of course some may question whether these places are 'legitimate' facilities. They are in any case quite legal, but don't take health insurance or give slips for reimbursement ... ha ha. And if sex cannot be therapeutic for many people, then what a sad and no doubt Puritanical day it is.
And by the way, as a coda: I always refuse a happy ending for personal reasons, perhaps a very slight saving grace on my part.