By virtue of the fact that extras are given, it surely negates the establishment being labelled as legit.
I do actually understand the question though: In essence, he is looking for a action from a place where it is highly unlikely, if it has ever happened. It’s probably what all of us think when we see the type of place that our wife’s would use for pampering. We know it’s legit, but we hope.
If I were you, I’d book massage sessions at the more obvious spa type beauty treatment places, that at first glance would be described as totally legitimate. Then try your luck. It’s probably a 1/1000 shot, but I guess it’s the only true way to seek what you are looking for.
I once got a wank from a Tunisian lady in a five star hotel complex while on holiday a few years ago. I’d like to think I was the only one, but I guess I’ll never actually know.