There was one legit place I used to go to years ago with my GF. At one point, my regular male masseuse told me that there was a new cute girl working there that was rumoured to be offering extras because she quickly started to have lots of regulars that would keep extending their sessions. Even regulars of other masseuses started going to her.

I couldn't try her out because my GF was always with me in the shop, plus one of the other lady masseuses there seemed to have a thing for me too.

Anyway, after a few weeks, they told me she got fired because she had an affair with the male boss and his wife found out about it. The rumours were true, she really was doing all sorts with her regulars!

The whole thing has taught me that it really is possible to get extras from a masseuse in a legit place if the "settings" are right. This particular shop had proper rooms, not open air cubicles. They also have double rooms where there are 2 open air cubicles in a bigger room. I assume she probably did it in the single rooms.