Speaking to a friend of mine (ahem) who was with his partner, he said it was funny one time when they both went into same massage place, as the wife wanted her feet done and suggested (innocently I might add) for him to have a normal massage. With this a very pretty little young thing (or so my friend tells me) took the man upstairs while the wife was downstairs getting her
feet seen to.
Once upstairs needless to say the pretty young thing started her magic and inquired as to whether extra services including full would be required. Now any decent man would of course just say "no, my wife is downstair" but my friend actually while saying that was easily persuaded that she was out of earshot. The deed was performed to everybodys satisfaction and my friend went downstairs happy.
Once downstairs it was business as usual for the pretty young thing on front of the wife, and afterwards wife did say, "t was great of them there, they even put on the television for me while I was getting my feet done".
So in answer to your question, they will do whatever it takes and have actually stated that if they see you walking with wife they will basically ignore you.
But that is what my friend told me.